I use a solder sucker:
Brand New Desoldering Pump Solder Sucker Solder Removal Tool Tools Bule | eBay
They work OK. Basically, you try to heat the pad with the solder sucker right over it at the same time. It's got a weird white material on it that doesn't melt from the soldering iron. Then when it's liquid, you push the button, and the solder gets sucked out. it's sort of an annoying process.