Woohoo! I just picked up a 50D to replace my XT, which has served me well but is in desperate need of upgrading. I was looking at 40Ds in the $375 used price range here in STL, but I came across a 50D with 25,000 actuations and otherwise in near mint condition for $475. Seemed like a no brainer to scrounge up $100 more and go for the 50D.
In any case, I can't wait to shoot some pics. Coming from the XT, this should be like a whole new hobby.