I always need to whack the drums with a sledge hammer to get them off. Always as in I if I have the drums off, put them on, blink, and goto take them off after I blink.. I need the sledge hammer. Hit the sides of the drum while pulling it outwards with your other hand... you should see it moving ever so slightly each whack - can take a while.

Of course do what everyone else mentioned before you take out the sledge hammer in case the brakes are in fact frozen against the drum. Either way, I'm guessing the sledge hammer will be used <img src="/forums/images/graemlins/shiner.gif" alt="" />

-Scerb