The Evolution of Halo Part 1: Pre-Xbox RTS to Third-Person versions. Part 1 shows Halo: Combat Evolved starting out as a real-time strategy game and later as a third-person shooter action game, including a ridable lizard and commentary from developers.
This was originally shown at the E3 2002 Fanfest.
Part 2 at:
• Evolution of Halo Part 2: Pre-Xbox 1999 Ve...
Unfortunately, this seems to be the best quality left available.
Enjoy!
http://www.ForumsExtreme.com