You'll need an Android 2.2+ device with Flash installed (though neither the XOOM nor the Tab 10.1 seem to be supported at this point, so looks like it's phones only for now), but if your handset meets the requirements, you'll be able to stream as many feature-length films and TV shows as you like, provided, of course, that they're in Crackle's catalog. The app itself is slick and simplistic, and better yet, it offers HQ streaming over both 3G and WiFi (and presumably 4G as well).
Again, both the app and the service will cost you no more than $0, and with a file size of just 1.3MB, I don't see any reason not to try it out.
Crackle - Movies and TV