Warning: mine is a minority position here on the board, but apparently not so far from yours. I thought it was possible that the country really was anti-Bush, but I now definitely think that Bush won the popular vote. But that doesn't mean that there wasn't a lot of real corruption in the election. I think a lot of voters got cheated. (And I think a lot more could get cheated in the future.)
On e-voting, I like Vote Trust USA,
http://votetrustusa.org, but there are lots of excellent groups and sites out there. Other folks will nominate favorites.
There is no single reliable source on Ohio. I think the Conyers report is a good place to start, even though a few of the arguments are really flawed -- or, for that matter, RFK's new article incorporates a lot of highlights from the Conyers report.
Exit polls -- here is where I am in the minority here on the board, and lots of folks can't understand why I bother. The people who think that the exit polls prove fraud tends to be (1) numerically savvy people who know very little about polling, or (2) people who believe group 1 because they sound so confident. If you look at publications like Public Opinion Quarterly or the American Political Science Review, they don't even bother to refute the exit poll arguments -- the arguments are dead on arrival. Some folks think this is some weird academic conspiracy. Not so much. (But I am an academic, so you can give me more or less credence as you like.)
Get informed locally. Is your county considering buying new machines? What do you know about registration procedures at your county board of elections (or whatever you actually have)? etc.