This limit is pretty bothersome when one considers that some people will probably choose 3G in part because they have limited access to wifi... Or maybe limited access during the day.
One would think that a wireless, always on connection would easily replace wifi, in EVERY way. It would be quite shocking and disappointing to find out this is not the case...after having bought a $500+ device and having signed up for a $30 web plan.
And then, there is the ABC app, wifi-only limitation (which, to be fair, is probably ABC's issue, not Apple's). It's really too bad, considering how much credit ABC got for beating the other networks to the iPad punch.