Something that could "remote control" any app through some form of App-specific remote window sharing would be a good start.  That would sell very well for awhile.<p>I think there's huge potential in this:<p><a href="http://www.insteon.net/" rel="nofollow">http://www.insteon.net/</a><p>I note that they have an SDK and what looks to be a whole bunch of PC apps.  The iPad could communicate with your home Mac or PC to a USB dongle which acts as hardware interface.