I believe more in a decoder chipset with an external hook-up to the tv, like the photo iPod to display image, but for video. I don't think looking at them on a tiny screen is a real solution, but maybe who know, maybe preview stuff before display them. What would be great is a keynote integration to do presentation with your iPod, a little remote clicker with TV output it may be possible. Thing I would like to see in order of priority:
1-texte input to take note on the go or add thing in the calendar
2-AM/FM radio (yeap local news from time to time is great to listen)
3-Voice recorder
4-Keynote integration with remote clicker
5-Video ouput capability
To do #4, you need #5, so we will see #5 before for sure.