Way back on December 16, 2009, I posted a very simplistic analysis showing that the GOP had roughly 3 chances in 5 of picking up Senate seats, about 1 in 6 of losing seats, and just a 1% chance at picking up 6 or more seats. I called this "things looking moderately up for the GOP".
Nate Silver's Predictatron, whose sophistication compared to my analysis is roughly that of a Boeing 787 Dreamliner to the Wright Flyer, shows the situation considerably stronger for the GOP: a 20% chance that the GOP picks up ten seats, and only a 3% chance of the GOP losing any net seats. Eight months ago I had the chance of the GOP picking up 10 seats at too low to be meaningful. Silver shows that a good bet would be for the Senate to be a 52-48 or 53-47 split, leaving Democrat, after the upcoming November elections. Considering how uneven the open seats are tilted toward the GOP, this is excellent news.