Switched from using YUI Compressor to Google Compiler. Minified and Gzipped filesize reduced to 22,839 bytes from 26,169 bytes (13% decrease in filesize). Sizzle copyright was merged into the main header (since it's removed automatically). Still passes all unit tests.

Makefile

@@ -29,7 +29,7 @@ JQ_MIN = ${DIST_DIR}/jquery.min.js
 JQ_VER = `cat version.txt`
 VER = sed s/@VERSION/${JQ_VER}/
 
-MINJAR = java -jar ${BUILD_DIR}/yuicompressor-2.4.2.jar
+MINJAR = java -jar ${BUILD_DIR}/google-compiler-20091218.jar
 
 DATE=`git log -1 | grep Date: | sed 's/[^:]*: *//'`
 
@@ -66,7 +66,8 @@ min: ${JQ_MIN}
 ${JQ_MIN}: ${JQ}
 	@@echo "Building" ${JQ_MIN}
 
-	@@${MINJAR} ${JQ} > ${JQ_MIN}
+	@@head -15 ${JQ} > ${JQ_MIN}
+	@@${MINJAR} --js ${JQ} --warning_level QUIET >> ${JQ_MIN}
 
 clean:
 	@@echo "Removing Distribution directory:" ${DIST_DIR}

build.xml

@@ -71,13 +71,24 @@
 				<include name="jquery.js" />
 			</fileset>
 			<arg line="-jar" />
-			<arg path="build/yuicompressor-2.4.2.jar" />
-			<arg value="--charset" />
-			<arg value="ANSI" />
-			<arg value="-o" />
+			<arg path="build/google-compiler-20091218.jar" />
+			<arg value="--warning_level" />
+			<arg value="QUIET" />
+			<arg value="--js_output_file" />
 			<targetfile />
-			<mapper type="glob" from="jquery.js" to="jquery.min.js" />
+			<arg value="--js" />
+			<mapper type="glob" from="jquery.js" to="tmpmin" />
 		</apply>
+		<concat destfile="${JQ_MIN}">
+			<filelist files="${JQ}, dist/tmpmin"/>
+			<filterchain>
+				<headfilter lines="15"/>
+			</filterchain>
+		</concat>
+		<concat destfile="${JQ_MIN}" append="yes">
+			<filelist files="dist/tmpmin"/>
+		</concat>
+		<delete file="dist/tmpmin"/>
         <echo message="${JQ_MIN} built." />
     </target>
 

src/intro.js

@@ -2,10 +2,15 @@
  * jQuery JavaScript Library v@VERSION
  * http://jquery.com/
  *
- * Copyright (c) 2009 John Resig
+ * Copyright 2009, John Resig
  * Dual licensed under the MIT or GPL Version 2 licenses.
  * http://docs.jquery.com/License
  *
+ * Includes Sizzle.js
+ * http://sizzlejs.com/
+ * Copyright 2009, The Dojo Foundation
+ * Released under the MIT, BSD, and GPL Licenses.
+ *
  * Date: 
  */
 (function(window, undefined){