if you have the sort of oven that can be set to under 200 degrees, placing the phone in dry rice in a bowl and convecting it will also work well.

RM, if this is one of the newer types of blackberries, it is also possible, GENTLY, to remove the tracking-ring and 'pearl', and use compressed air to dry the area under the trackball. I used to do this, then clean the 'pearl' itself with screen-wipes or something else that's mostly alcohol, and reassemble to fix phones all the time.