Nope. Big hole in its software is it can't handle Javascript. Lots of speculation in posting forums for users about it coming sometime but until it does too many sites will be unusable. I had the very first version, the B+W one, and it wasn't bad. If I remember right I could only bet with Pinny and WSEX with it. I got a Palm 300 instead and was able to add a few others, Holly and Sky. The new Palms 600/650 can handle Javascript so I am guessing you can bet with just about anyone.
Also be wary about coverage. TMobile has lots of holes. I am on Sprint now and its far better. Still for the money, which with rebates now is pretty much free with service, the Sidekick is a great deal.