For RedPower2 and (later) ComputerCraft, here's a programming forum: http://skcraft.com/forums/minecraft-programming/
That's awesome. Can't wait to get down and dirty with ComputerCraft. Glad to see that it's been approved for Alice, too.
Can someone tell me why I'm better with only abstract things about programming ? I mean that I'd better make a "Hello world" byte-per-byte into the computer to the screen through wires in real life than even making it into computer craft!