I had the same problem and I took it to the local shop that I've been using to install my tire rack tires. They put it up on the lift and banged on the wheel with a rubber mallet. It came off after just a few hits. I'd done everything I could think of while it was on the jack stands, but I was worried about banging on the wheel while under the car while it was up on stands. Oh yeah, and I don't have a rubber mallet.
If you don't have a shop that will do this for little or no charge, take it to a brake shop for a quote. They'll have to get the wheel off to look and who knows, it may be worth letting them do the brakes too.