My colleague Lance Fortnow, a computer scientist at the University of Chicago, has just put up a map that shows the status of the U.S. Senate races based on the current trading prices at Tradesports.com, with a nice feature -- the color of the state on the map is a shade between red and blue (or green for independents) that proportionally reflects the relative prices of the red and blue contracts.  You can find the prices for each state by moving the cursor over it.

The trading community is now very confident of Democratic pickups in MT, OH, PA,  and RI, and are fairly sure Lieberman will hang on it CT.  They favor the GOP in VA and TN, favor the Dems in MD, and consider MO and NJ tossups.