Tom Bevan at Real Clear Politics has two nice charts of the
36 Gubernatorial and 33 Senate races on the ballot in 2006. He also has a few useful paragraphs on which party is at an advantage or disadvantage (GOP advantage for the Senate races, and slight disadvantage for gubernatorial races). He writes: "All in all it should be a very entertaining midterm, especially given what happened last Tuesday and knowing that, at least for those incumbents in the Senate [Mark Dayton in Minnesota, Debbie Stabenow in Michigan, Maria Cantwell in Washington, Bill Nelson in Florida]. This will be their first time standing for election after the terrorist attacks of September 11, 2001."