I use QuickLook constantly for everything from pictures, movies, text files, and of course, source code. Source can be a pain to view in QuickLook because there’s no syntax highlighting by default, but this plugin changes that. QLColorCode is a must-have QuickLook plugin for developers, it allows color syntax highlighting of nearly any type of source code from directly within QuickLook, making a quick glance at code infinitely easier. It’s free so download it now, you’ll thank me later.
Installation is simple, drop the plugin into ~/Library/QuickLook/ and restart the Finder and you’re good to go!