Generally speaking, I'm working on a number of variations of the Brazilian baião beat, including a couple that make use of the cowbell footpedal I picked up a while back (gotta find a use for it, no? LOL).
In terms of beats from songs, a couple of my favorites are:
Manu Katche, on "My Secret Place" (Chalk Mark In A Rain Storm, Joni Mitchell)
Stewart Copeland, the half-time groove that starts out the tune, "So Lonely"