This is my WordPress plugin which will help you make your Website more quick. It can grouping and packing Java Scripts and CSS. Also it makes fewer HTTP requests.
Download
http://wordpress.org/extend/plugins/js-css-script-optimizer/
Features
Combine several scripts into the single file (to minimize http requests)
Pack scripts using Dean Edwards’s JavaScript Packer
You can move all JavaScripts to the bottom
Combine all CSS scripts into the single files (with grouping by “media”)
Pack CSS files (remove comments, tabs, spaces, newlines)
Ability to include JavaScript and CSS files
If any script fails and shows error you can add it to exclude list
Usage Recommendations:
This Plugin processes only those scripts that are included properly (using “wp_enqueue_script” or “wp_enqueue_style” function)
Uploads directory should be writable
Read How to properly add CSS in WordPress