I think at the beginning of the first debate the moderator said only he knew what the questions were. I don't recall if he said anything about getting input from others or if he alone came up with a list of what to ask.
There may be a web site which takes questions. I don't know.
Gore and Bush are highly prepped for any standard political question. I'd like to see the moderator shake 'em up a bit with more hard hitting questions -- you just never see a candidate really stumped on a question. Why not get Bush to talk about his record on pollution in TX? Why not get Gore to speak to issues of campaign fund-raising? I'm tired of pre-canned answers.