My Basic Programming Tutorial is still operational.
http://wolron.com/programmingtutorial
Besides teaching you how to program in BASIC (namely using BlitzBasic), there are multiple examples on there for some classic games and game types (Mario, Tetris, Asteroids, etc.).
It's still a work in progress, and always has been, but there's plenty of info on it as it is...
But anyways, check it out if you like.