Final prediction.
Changes:
Manchin has moved so far to the right that it's almost impossible to tie him to Obama and Raese has committed enough gaffes to swing this back into the Democratic (or perhaps DINO) column.

Changes:
NV: Reid has been unable to maintain his momentum. The debates (probably Reid's only strength) have been inconclusive and Angle's campaign as well as fund raising have been stronger than before, so it seems to indicate that after regaining the lead, she'll keep it to the finish.
WI: Johnson has led a very strong campaign and he has managed to get well through the debates, his only possible weakness. There is little hope of a turnaround now.
WV: Obama is so unpopular here that even a Governor as popular as Manchin can be defeated by association with him. His surge to the right is most likely too little, too late.

Update after the Sept 14 primary.
Changes:
DE: O'Donnell isn't favored even by Castle primary voters and the NRSC has abandoned the state.
IL: Kirk seems to have the advantage at the moment, though is still very close.
NV: After a series of negative ads, Reid seems to have succeeded in portraying Sharon Angle as extremist and has regained the momentum.
WI: This race has been under-polled. With Feingold still reasonably popular and leading in fundraising, it's perhaps too hasty to assign this as Republican pickup, especially just on the word of a Republican leaning agency.