JS & CSS Script Optimizer plugin by evgenniy will help you make your Website quicker.
Combine several scripts into the single file (to minimize http requests)
Combine all CSS scripts into the single files (with grouping by “media”)
Pack CSS files (remove comments, tabs, spaces, newlines)
If any script fails and shows error you can add it to exclude list
This Plugin processes only those scripts that are included properly (using “wp_enqueue_script” or “wp_enqueue_style” function)
Uploads directory should be writable
More info http://4coder.info/en/wordpress-js-css-optimizer/.