What is UD?
Well, for some of us, it's a life-consuming passion to get PC's to crunch numbers in the hope that we can assist in finding a cure for cancer, and possibly other diseases. It works by allowing your PC to use power it doesn't normally get to use to work on some specific problems set by scientific researchers at Oxford University.
The real trick is to get as many PC's as you can to join in the fight - the faster the problems are worked out, the more likely a cure will be found.
So our passion is to buy / cobble together / steal (
never! 
) PC's that we can connect together and keep running UD on. All in the name of research (and fun!

).
That's what UD is, IMO.
BTW, Welcome to TechIMO, dunbar!
And I echo Fingers' sentiments - hope to see you on the UD stats pages soon!!!