lcd's that can do 1920x1200 and tv's that can do 1080 lines are easy to come by and are common.
They're also far more expensive than just-as-good cheaper LCDs - Samsung Series 4 and Series 5 televisions are exactly the same styling and features as Series 6, but with a 1366x768 panel resolution.
It's really quite good for sitting 8 feet away. I don't see HOW you could see 1920x1080p resolution, I can barely make out pixels on rounded edges from here.
Watching a movie, you will see even less, since the whole point of the video codecs used to encode HD video is to smooth out the differences and only encode things the eye will actually see.
i would not buy a device that can not do that resolution.
Then you are not going to be buying any portable devices that decode video any time soon.
also, hdmi is the standard now too. the beagal board is partially there. (still trying to figure out why why the wii missed that one)
Beagleboard supports DVI-D which is the same transmission standard as pushed over an HDMI cable. You just need an adapter.
The Wii did not miss anything. It was INTENTIONALLY designed to only render at 480p. This means you get a box the size of 3 DVD cases stacked, and has only a very small outlet fan.
Product design is a lot more than finding the fastest, hottest things you can use to give the biggest numbers.