mSpot is clearly itching to own your iDevice in the same way that Netflix owns your DVD player (and to a lesser extent, your computer). To its raft of iPhone, Crackberry, Droid, and WebOS flavors, they have now added an iPad-optimized viewing client.
Unlike the "red-envelope crew," mSpot eschews montly fees for a per-view plan (usually US$2-3.99 per movie; trailers can be screened for free). Even better, you have the option of streaming your movies over your 3G network; take that, AT&T! (Although it goes without saying that you'll get better quality over a Wi-Fi connection…)
Coming on the heels of the recent Hulu "iPadization", it would appear that the Apple tablet is on track to become THE ubiquitous portable consumer terminal.