WIKI Predictions. Repubs have a lot of work to do if they want 50 seats.
http://en.wikipedia.org/wiki/United_States_Senate_elections,_2010#PredictionsOverview of races (37 seats)
2.1 Retiring Democratic Senators (5 seats)
2.1.1 Christopher Dodd of Connecticut
2.1.2 Ted Kaufman of Delaware
2.1.3 Roland Burris of Illinois
2.1.4 Paul Kirk of Massachusetts
2.1.5 Byron Dorgan of North Dakota
2.2 Retiring Republican Senators (6 seats)
2.2.1 Mel Martinez of Florida
2.2.2 Sam Brownback of Kansas
2.2.3 Jim Bunning of Kentucky
2.2.4 Kit Bond of Missouri
2.2.5 Judd Gregg of New Hampshire
2.2.6 George Voinovich of Ohio
2.3 Democratic incumbents (14 seats)
2.3.1 Blanche Lincoln of Arkansas
2.3.2 Barbara Boxer of California
2.3.3 Michael Bennet of Colorado
2.3.4 Daniel Inouye of Hawaii
2.3.5 Evan Bayh of Indiana
2.3.6 Barbara Mikulski of Maryland
2.3.7 Harry Reid of Nevada
2.3.8 Kirsten Gillibrand of New York
2.3.9 Chuck Schumer of New York
2.3.10 Ron Wyden of Oregon
2.3.11 Arlen Specter of Pennsylvania
2.3.12 Patrick Leahy of Vermont
2.3.13 Patty Murray of Washington
2.3.14 Russ Feingold of Wisconsin
2.4 Republican incumbents (12 seats)
2.4.1 Richard Shelby of Alabama
2.4.2 Lisa Murkowski of Alaska
2.4.3 John McCain of Arizona
2.4.4 Johnny Isakson of Georgia
2.4.5 Mike Crapo of Idaho
2.4.6 Chuck Grassley of Iowa
2.4.7 David Vitter of Louisiana
2.4.8 Richard Burr of North Carolina
2.4.9 Tom Coburn of Oklahoma
2.4.10 Jim DeMint of South Carolina
2.4.11 John Thune of South Dakota
2.4.12 Bob Bennett of Utah