You're probably asking, what the heck does Hawkeye have to do with Thor? He's in no way even close to an Asgardian. You couldn't even say that Clint and Thor were best buddies or anything. Apparently, a new rumor has surfaced that makes some sense.
Superherohype pointed out that in the latest issue of Empire Magazine, actor Jeremy Renner brought up Hawkeye. He basically indicated that Marvel was looking for someone to do a cameo as Hawkeye in Thor when all the heroes get together (probably similar to Samuel L. Jackson's cameo at the end of Iron Man).
I haven't actually read the latest issue of Empire Magazine so if someone has it, can you verify this quote? It shouldn't be too big of a surprise if I said I would love for Hawkeye to show up. It was in December 2008 that the rumor of Hawkeye and Black Widow appearing in Iron Man 2 surfaced. Obviously we know that Black Widow made the cut. Let's hope that we can soon see Hawkeye on the big screen. As far as Jeremy Renner playing him, I don't know much about him so I can't comment on whether or not he'd be a good choice (he was in 28 Weeks Later).
"Hawkeye could be interesting. They're going to send me some stuff on it, see what it is, but I think they're pretty awesome, trying to make superhero movies almost plausible and not just some fantasy thing."