drum machine w/ good user base?

[gorcorps]

I want some sort of drum machine so I can play my guitar with a beat. It would be good if there was some sort of database of user made beats for songs already.

Or if there's somewhere I can just get the drum tracks that would be good too. Any ideas?

 

[DeckardBlade]

It's not a hardware solution, but you could certainly do what you want with Reason http://www.propellerheads.se/.

It has a good userbase as well.