Sure, the Slingplayer app for the iPhone may be just around the corner, and rumors of a Hulu app have been floated. Does that give you Kirk and Spock during your morning commute? No, I didn't think so.
CBS Interactive's TV.com app is a free download from the App Store, and works either over WiFi or 3G. I have a hunch it's not going to be available outside of the US store, so if you're able to check that out please let us know. Update: As suggested, I checked myself -- not in the UK store, not in the German store.