Adam R:
I would love to watch DTM, MotoGP, and WRC. However, I don't have cable in my apartment (I'm a poor college student ), and there isn't much in the way of coverage for any of these three series here in the States anyways. I know there's MotoGP on Speed, but it's only the race.
Not sure if you can access it in North America but Germany´s ARD publishes the DTM races online. Take a look below Mediabox on the right side, all season´s races are broadcasted in enitre length. On top of that, learn German by listening to the commentators...