The App Twitterfon which was released on 5/15/09 apparently gave away an upcoming feature that the iPhone will soon receive.  Tv shows have long been available to watch on your iPhone or iPod touch via a sync with iTunes.  It appears that now you will be able to download them directly on your iPhone.  While someone was browsing the app, 3 ads appeared which said "iTunes Movies’, ‘iTunes TV’ and ‘iTunes Movie Rentals’. When the app user tapped on one of the ads, they were brought to a familiar interface of which is incomplete.  There is not a whole lot of inforation on the availability of such features, but you can bet 3.0 and WWDC probably will have some part in it.  For more screenshots and information head over to Open Salon.