diff --git a/CHANGELOG.md b/CHANGELOG.md
index 745358c3..8bb7492e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,7 @@
 * Nested layouts using `wrap_layout` helper
 * Support for placekitten.com
 * Added MM_ROOT environmental variable
+* activating extensions can now take an options hash
 
 2.0.14
 ====
diff --git a/features/asset_host.feature b/features/asset_host.feature
index 3736643b..71117ba3 100644
--- a/features/asset_host.feature
+++ b/features/asset_host.feature
@@ -2,13 +2,11 @@ Feature: Alternate between multiple asset hosts
   In order to speed up page loading
   
   Scenario: Rendering css with the feature enabled
-    Given I am using an asset host
-    And the Server is running at "test-app"
+    Given the Server is running at "asset-host-app"
     When I go to "/stylesheets/asset_host.css"
     Then I should see "http://assets"
     
   Scenario: Rendering html with the feature enabled
-    Given I am using an asset host
-    And the Server is running at "test-app"
+    Given the Server is running at "asset-host-app"
     When I go to "/asset_host.html"
     Then I should see "http://assets"
\ No newline at end of file
diff --git a/features/feature_params.feature b/features/feature_params.feature
new file mode 100644
index 00000000..14eb0fa6
--- /dev/null
+++ b/features/feature_params.feature
@@ -0,0 +1,6 @@
+Feature: Be able to pass params to extensions
+  Scenario: Read some simple variables
+    Given the Server is running at "feature-params-app"
+    When I go to "/index.html"
+    Then I should see "hello: world"
+    And I should see "hola: mundo"
\ No newline at end of file
diff --git a/features/step_definitions/asset_host_steps.rb b/features/step_definitions/asset_host_steps.rb
deleted file mode 100644
index 4bc752ae..00000000
--- a/features/step_definitions/asset_host_steps.rb
+++ /dev/null
@@ -1,9 +0,0 @@
-Given /^I am using an asset host$/ do
-  @initialize_commands ||= []
-  @initialize_commands << lambda { 
-    activate :asset_host
-    set :asset_host do |asset|
-      "http://assets%d.example.com" % (asset.hash % 4)
-    end
-  }
-end
\ No newline at end of file
diff --git a/fixtures/asset-host-app/config.rb b/fixtures/asset-host-app/config.rb
new file mode 100644
index 00000000..3338c450
--- /dev/null
+++ b/fixtures/asset-host-app/config.rb
@@ -0,0 +1,6 @@
+set :layout, false
+
+activate :asset_host
+set :asset_host do |asset|
+  "http://assets%d.example.com" % (asset.hash % 4)
+end
\ No newline at end of file
diff --git a/fixtures/asset-host-app/source/.htaccess b/fixtures/asset-host-app/source/.htaccess
new file mode 100644
index 00000000..875bc5c4
--- /dev/null
+++ b/fixtures/asset-host-app/source/.htaccess
@@ -0,0 +1 @@
+# I'm an htaccess file!
\ No newline at end of file
diff --git a/fixtures/asset-host-app/source/asset_host.html.haml b/fixtures/asset-host-app/source/asset_host.html.haml
new file mode 100755
index 00000000..7588118c
--- /dev/null
+++ b/fixtures/asset-host-app/source/asset_host.html.haml
@@ -0,0 +1 @@
+= image_tag "blank.gif"
\ No newline at end of file
diff --git a/fixtures/asset-host-app/source/images/blank.gif b/fixtures/asset-host-app/source/images/blank.gif
new file mode 100755
index 00000000..2498f1aa
Binary files /dev/null and b/fixtures/asset-host-app/source/images/blank.gif differ
diff --git a/fixtures/asset-host-app/source/stylesheets/asset_host.css.sass b/fixtures/asset-host-app/source/stylesheets/asset_host.css.sass
new file mode 100755
index 00000000..5a67f373
--- /dev/null
+++ b/fixtures/asset-host-app/source/stylesheets/asset_host.css.sass
@@ -0,0 +1,3 @@
+@import "compass"
+h1
+  background: image-url("blank.gif")
\ No newline at end of file
diff --git a/fixtures/feature-params-app/config.rb b/fixtures/feature-params-app/config.rb
new file mode 100644
index 00000000..26eeec55
--- /dev/null
+++ b/fixtures/feature-params-app/config.rb
@@ -0,0 +1,12 @@
+set :layout, false
+
+module ExtensionA
+  class << self
+    def registered(app, options={})
+      app.set :a_options, options
+    end
+    alias :included :registered
+  end
+end
+
+activate ExtensionA, :hello => "world", :hola => "mundo"
\ No newline at end of file
diff --git a/fixtures/feature-params-app/source/index.html.erb b/fixtures/feature-params-app/source/index.html.erb
new file mode 100644
index 00000000..0435545e
--- /dev/null
+++ b/fixtures/feature-params-app/source/index.html.erb
@@ -0,0 +1,3 @@
+<% a_options.each do |k, v| %>
+  <%= k %>: <%= v%>
+<% end %>
\ No newline at end of file
diff --git a/lib/middleman/base.rb b/lib/middleman/base.rb
index c50e7aac..b062d88d 100644
--- a/lib/middleman/base.rb
+++ b/lib/middleman/base.rb
@@ -54,6 +54,15 @@ class Middleman::Base
       end
     end
     
+    # Set the shared instance
+    #
+    # @private
+    # @param [Middleman::Base] inst
+    # @return [void]
+    def inst=(inst)
+      @inst = inst
+    end
+    
     # Return built Rack app
     #
     # @private
@@ -128,9 +137,11 @@ class Middleman::Base
     # @param [Symbol] Unique key name
     # @param Default value
     # @return [void]
-    def set(key, value)
+    def set(key, value=nil, &block)
       @defaults ||= {}
       @defaults[key] = value
+      
+      @inst.set(key, value, &block) if @inst
     end
   end
   
diff --git a/lib/middleman/core_extensions/extensions.rb b/lib/middleman/core_extensions/extensions.rb
index 204a7eab..d7543b19 100644
--- a/lib/middleman/core_extensions/extensions.rb
+++ b/lib/middleman/core_extensions/extensions.rb
@@ -71,12 +71,17 @@ module Middleman::CoreExtensions::Extensions
     # 
     # @param [Array<Module>] new_extensions Extension modules to register
     # @return [Array<Module]
-    def register(*new_extensions)
+    def register(extension, options={}, &block)
       @extensions ||= []
-      @extensions += new_extensions
-      new_extensions.each do |extension|
-        extend extension
-        extension.registered(self) if extension.respond_to?(:registered)
+      @extensions += [extension]
+      
+      extend extension
+      if extension.respond_to?(:registered)
+        if extension.method(:registered).arity === 1
+          extension.registered(self, &block)
+        else
+          extension.registered(self, options, &block)
+        end
       end
     end
   end
@@ -89,10 +94,12 @@ module Middleman::CoreExtensions::Extensions
     #
     #     activate :lorem
     #
-    # @param [Symbol, Module] feature Which extension to activate
+    # @param [Symbol, Module] ext Which extension to activate
     # @return [void]
-    def activate(feature)
-      ext = ::Middleman::Extensions.load(feature.to_sym)
+    def activate(ext, options={}, &block)
+      if !ext.is_a?(Module)
+        ext = ::Middleman::Extensions.load(ext.to_sym)
+      end
       
       if ext.nil?
         puts "== Unknown Extension: #{feature}"
@@ -100,7 +107,7 @@ module Middleman::CoreExtensions::Extensions
         puts ext
       else
         puts "== Activating: #{feature}" if logging?
-        self.class.register(ext)
+        self.class.register(ext, options, &block)
       end
     end
     
@@ -108,6 +115,7 @@ module Middleman::CoreExtensions::Extensions
     def initialize
       super
       
+      self.class.inst = self
       run_hook :before_configuration
     
       # Search the root of the project for required files
diff --git a/lib/middleman/extensions/asset_host.rb b/lib/middleman/extensions/asset_host.rb
index f9f05db2..94adef58 100644
--- a/lib/middleman/extensions/asset_host.rb
+++ b/lib/middleman/extensions/asset_host.rb
@@ -18,15 +18,16 @@ module Middleman::Extensions
     module InstanceMethods
       def asset_url(path, prefix="")
         original_output = super
+        return original_output unless asset_host
 
-        valid_extensions = %w(.png .gif .jpg .jpeg .svg .svgz .js .css)
+        # valid_extensions = %w(.png .gif .jpg .jpeg .svg .svgz .js .css)
 
         asset_prefix = if asset_host.is_a?(Proc)
           asset_host.call(original_output)
         elsif asset_host.is_a?(String)
           asset_host
         end
-
+        
         File.join(asset_prefix, original_output)
       end
     end