1 - Put the oven on the lowest setting, let it heat up and leave the door cracked. Put your bud on some foil and stick it in for a few minutes. Keep an eye on it. In a few minutes it'll be dry enough to smoke. (This is the method I've always used)
2 - Stick bud in a sock or pair of pantyhose. Blow hot air from a hair dryer through the sock until bud is dry.
3 - Place foil over top of lampshade. Put bud in foil and after several hours bud will be dry.
4 - Put bud on foil and place on top of cable/sat. receiver. Several hours to a day later bud will be dry.
5 - Microwave it.
The only method I've used is the first and it works good. Tends to dry the outside more than the inside though and sometimes depending on the density of the bud, it may become moist again as you smoke it. You just have to torch the shit out of it as you puff and it'll eventually burn up. Works good for airy, bottom popcorn buds.
Good luck.