I have that card. You're right to want to remove it. Take it out and get a radeon le from ati, they're less than $70 now.
If you've removed the screw holding the back of it onto the opening at the back of your case, just pull it free of the slot. some cases fit kinda tight and the card can get sorta wedged in behind the frame of the case in the same area as where the screw goes, so be careful, but basically aside from that one screw there's nothing but friction holding it in.
-Taylor