Syntax highlight source code within QuickLook
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!

I have syntax highlighting on Snow Leopard.. I think this is more relevant for Leopard (10.5) only..
SL here too, with syntax highlighting by system default!
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