Since there are fewer Senate and governors' races tonight, they're pretty easy to keep track of, so political junkies probably already have their checklists prepared in that regard. For critical House races, DailyKos and MyDD have set up a pretty handy list for your use and enjoyment. And keep watch on the early results from Kentucky and Indiana; the polls close there at 6:00 EST/3:00 PST. Lastly, for hardcore junkies, this is the one day you actually have a good excuse to visit the Drudge Report, where he posts semi-accurate exit poll data during the day.