What are you using for desktop search?

Yea, we know you use Google for web searching, but what about the desktop? I recently rebuilt my office computer and put the MSN Toolbar Suite (I am not a fan of the name) on it. I also have MSNTBS on my laptop. I noticed that a lot of people tried Google Desktop Search, but after trying it...and reading about it, I removed it. Two others I have heard good things about are X1 and Copernic Desktop Search. What are you using and why?