(Boring geeky ramblings below...)
Up until recently, I was a Windows user, and made a lot of use of Google's desktop search toy. Secretly though, I wanted a Mac so I could use the wonderful Spotlight search system.
... it's great. Sorry, boring to hear though it may be, I still haven't decided that it's a waste of money.
(This post is very much a rambling stream of consciousness. Don't bother reading it. No, seriously...)
* Caution: may contain more Alex Harries. Sorry about that.