The dKos
Senate rankings, courtesy of me, Jerome, and Stephen Yellin (MrLiberal) have been updated.
To summarize, Dems have three solid pickup opportunities in Illinois, Oklahoma and Alaska (in that order). Republicans have a sure-thing pickup in Georgia, and five moderate pickup opportunities in South Carolina, North Carolina, Florida, Louisiana, and South Dakota (also in that order).
Note that if these races were decided based on the latest polling, Dems would win IL, OK, and AK, and lose only GA. But that's in fantasy early-in-the-cycle poll land. Reality is things will get much tighter and much uglier, and a Democratic two seat net gain is not likely.
(This diary has some good background on the Alaska race. The DSCC has a blog as well.)