Cleveland. I don't see anything else. If he will play he will play for the Cavaliers. http://insider.espn.go.com/blog/nba/rumors/
Allen is both old and hasn't played in quite a while. I'm not sure what value he's going to bring. Rip Hamilton is a free agent, for what it's worth. I think they're close to the same age.
Allen will hit some 3s in a playoff game. This will be hyped somehow and the most games he isn't quite important to win