Just happened to me. vbSEO rewrite settings randomly reverted to the 001 option and a member said that the search engine redirected her to a file download site. I instantly recalled reading about this happening to people here.
Reuploaded the vbseo xml which seems to have fixed the Google redirection from what I can tell. Will go through the suggestions in this thread.
Pretty awful feeling, though. I don't have time to check up on each of my websites and happened to log in today to catch the exploit just hours after the code was injected. Huge eye-opener.