Here is the election night scorecard from the National Committee for an Effective Congress (NCEC).
It's circulating the web in pdf format, but I've converted it to the much more user-friendly jpg format.
The front page lists the basics: Obama states, McCain states, tossup and battleground states, with electoral college votes for each. But what makes it especially useful is that it that it divides it all up by when the polls close, and gives you an hour-by-hour breakdown of what's at stake and what to be watching for.
The back page lists all US Senate races and the top 50 US House races.
It's the must-have cheat sheet for tomorrow night's election parties. And remember: a lot of the key states will be finished voting by 8:30pm ET/5:30pm PT. So if it's suspense you want, get to the party early.
(Click to enlarge.)