code.google.com/p/bundle-fu – Rails Plugin for Bundling
code.google.com/p/bundle-fu In Their Own Words
Why code.google.com/p/bundle-fu It Might Be A Killer
Having many tiny links and files slows down your download time, however, Bundle-fu doesn’t require any additional xml config files and makes asset bundling possible with merely two lines of code. Bundle reduces the amount of links you’ll need, and make your coding neater.