"Represent, Cuba" off the Dirty Dancing: Havana Nights soundtrack is currently being beaten to death by our Champaign-Urbana hopefuls at the studio. One even made it his ringtone. If I never hear that song again...
Um, let's see what else can be used:
"My Humps" by the Black Eyed Peas- it's a little fast, and more west-coasty, but we use it a lot.
"Tilt Ya Head Back" by Nelly, featuring Christina Haguilera is a little slow I think.
Most recent renditions of "Sway" by the Pussycat Dolls and Michael Buble and the like.
Another worn-out one: "Smooth" by Santana and Rob Thomas.
"Every Morning" by Sugar Ray. "Someday" works okay, too.
Then your cheesy old ones like Tea for Two, Frenesi, CP&ABW, etc.