I think it's a great idea, but other than that I don't have any info.

Several years ago we had a small tornado go through a nearby town. This was on a weekend, and the local AM/news radio stations are unmanned overnight or on the weekends. The only local news was TV, and I had no power. I had a portable LCD battery TV, though, so I had news. This was great. My AM/FM radio was useless.

I've been looking, on and off, for a decent portable digital TV, but the last time I looked I didn't find any great reviews. Maybe now that digital is the only option there will be some new models.