Probably old, but anyway...
Add Vista-like searching function to your XP with the Windows Desktop Search. Actually, Vista's Instant Search was derived from this program, they just integrated it to the start menu. This one however acts like a toolbar. But their use is pretty much the same. Now you don't have to wait for ages for search results.
More details :
http://www.microsoft.com/windows/des...h/default.mspx
WARNING: To those with 'shady' copies of Windows XP, if you wish to download this feature, do not download from Microsoft because it will check whether your copy is genuine. Get it from somewhere else, Google will give results fast.