Justin writes: I'm an aspiring producer. Do you know where I can find writers who'd be willing to work on spec for a couple ideas I have?
Here's the problem...I don't know if I can really advise any aspiring writers to work on spec for aspiring producers, unless they are close friends and really want to give it a shot. Why? No manager, agent, producer or executive is going to see a script that has an attached producer with no experience or credits as a good thing.
(Also, you may want to be aware that all writers have plenty of ideas of their own that they want to work on.)
I know you may want to jump into you producing career, but I'm not sure this is the best way to do it. Usually the way to start producing is to become an assistant at a production company and get promoted. This often involves being an assistant at an agency first, or perhaps being a PA or receptionist at the production company and working your way up (I have friends who have done both).
The other path would be to start producing things independently, if you know how and can somehow raise money. You might look into film schools - The Peter Stark Producing Program at USC is definitely recognized in Hollywood, and many of its alums have been very successful.
Maybe you could start with a short. And to actually answer your question, maybe try the TV Writers Yahoo Group.