If it was a gummy aluminium you're pretty much hooped other than drilling from the back side so you can punch it out or the acid trick which were both mentioned above. There's also electro milling but that's pretty pricy to salvage a small bit of aluminium. If you do the acid bit remember your high school chemistry. It's acid into the water. NOT water into the acid. Even so you need to add the acid slowly if it's very strong. You'd probably also want to use distilled water instead of tap stuff to avoid any interaction of the acid with the usual chlorine and flouine in the tap water.
The other option is to toss it and start over. And this time use a better grade of metal or at least use more cutting fluid so it can't gum up.
Hey, at least the new drill bit you need to buy now will be sharp. There's always a silver lining to the storm cloud if you look hard enough.....
Makes you want to reach out and smack me doesn't it?
