Recently Llewellyn Falco and I did a webcast for DevelopMentor where we demonstrated some TDD techniques and introduced Approval Tests. We let the audience choose our project and they chose Space Invaders. It was all great fun. Now the videos and MP3 streams are online and available for download.
Be sure to check out the write-up we did afterward where we talked about the tools and gave you a chance to try it for yourself:
TDD Space Invaders Write-up
You can also watch two other, higher level agile webcasts by Bill Nazzaro here:
Agile Webcasts at DevelopMentor
Cheers!
Michael