Best Way to Get Kids Started in Programming?

kbh3rd writes: "A couple of my kids are starting to make noises about learning to program computers, just like their old man. 8^D I'm totally unsure how to start out. I'm a *nix geek, but I don't know if they'd keep interest if started with 'main () { printf ("Hello, world!\n") ; }' and command-line gcc. They almost exclusively use Win98 because that's where their games run. I can't believe I'm saying this, but maybe they should start with something where they could get some Windows programs going, like VB (shudder) or Delphi? What language/development environment would be best for kids aged 11-13 who think they want to learn some programming over the summer? And what are some good books they might start with, too? "