Apparently I'm late in my discovery, but I just thought I would share this with you anyway.
As I have mentioned previously, Google is the most powerful search engine on the internet. Not only is it capable of doing the more mundane search duties, it now offers a method to index all of the files on your hard drive.
No longer will you have to search for that elusive filename, simply type a few characters that describe what you want. The speed is exceptionally good, and the accuracy is remarkable.
Please be advised that Google Desktop is a beta program that only runs on M$ windows. Because Google is Linux friendly, I'm sure that the company will eventually release the desktop search software for other operating systems.