McCain has chosen Sarah Palin as his VP Running Mate.
Thomas Peters has some links, and of course, the McCain campaign has the announcement right here.
Aside from her excellent conservative credentials, Palin has a reputation as someone who takes on corruption in her own party.
She's an Idaho native (born in Sandpoint) and attended U of I during the same time I was there. I don't recall crossing paths with her, but I know a few people who were probably in the same program with her.