Or, how to learn to play along with drums without being in an actual band:
1) fire up the
Hydrogen drum machine (freeware!)
2) play demo "Diddly" or "Jazz"
3) improvise!
This is great because you can't settle into an easy strum/chord pattern and stay there--the drums keep mixing it up, and so will you. If you're a n00b like me, have fun fumbling over strings whenever your brain starts thinking, "hmm, some melody would be nice."
I wonder if there's a way to randomly play single-measure rock and jazz drum patterns in 4/4 time, so that the drum machine really is improvising along with you.
(Lisa, I guess you could call this "getting down with Hydrogen.")