Hmm, I don't recall what team number it was, but there was a team across from us (#121) at the pits in Atlanta that had this wicked awesome automatic transmission display all set up. That was really cool. I'd love to be on their team so I can meet and pick the brain(s) of whoever came up with that. Also 494 (I think it was) had another really cool centrifugal CVT that looked rather impressive.
So those two because they have cool transmission ideas, and I'm a gearhead.

Also 126 because they're all around cool, as well as 273 and 1350 (Rambots!).
Oh, and the team I'm trying to start here at BYU
MrToast