I have been using Google Desktop on a PC almost since it was out. It is very fast and beats the nuts of the standard windows XP search. Keeping in mind that you have spotlight why you may ask would u want to use Google desktop. Well speed wise its probably the same it would boil down to a few differences the first is Google cache your files so if u delete a file u can still search it. It has a vast array of plug-ins one of which is Larry’s Any Text File Indexer, it allows you index previously unindexable files in fact it will make Google try and index any file type you like this is specifically relevant to code files. This means all your code can be indexed.