One minor hitch... I clicked your link, was asked to login, successfully logged in and was redirected to a page that didn't link to Senate predictions (it did to Governor predictions, and to 2004, and...) I was still able to make a prediction though, I just had to return to the forum and click the link again.
I had the same problem. But it worked out for me too. I don't get one thing about the polls though. Some states seem to be listed as leans even though they have only one poll. And there are too few states overall I think?