The Election Map
The New York Times has a pretty cool election map on their site, that lets you look at all the races coming up in November. You can click on individual races and tinker with the outcomes to see how that affects the overall map.
I don't know how reliable the predictions are. It's calling the House race for Nevada's second district a toss-up. Please. That seat is stamped "Property of the Republican Party," and nothing's going to change that. And it doesn't tell you how individual House candidates are polling, and that's the more interesting race this time around, as it's the most likely to change hands.
Still, it's fun to look at, and anyone who's feeling depressed about Republican prospects can take comfort. It's hardly a lock, but the GOP can still pull this thing out of the fire.