Me and two other enthusiasts are building a game like Wolfenstein/Doom from scratch. I am writing the engine, tools, and game logic, and they are producing all of the game art. We'd be happy to exchange ideas with you on our forums at:

http://bsdlproject.freeforums.org/

They look very empty, but that's because those are the public forums and we haven't bothered to advertise ourselves nearly at all. Our developer board, where we hold 99% of our discussion, is hidden to users outside of the team.