Check out this project at Kickstarter http://www.kickstarter.com/projects/484889112/the-pocket-tv-makes-any-tv-a-smart-tv
And an Android one with a review over at Liliputing http://liliputing.com/2012/05/74-pc-on-a-stick-features-allwinner-a10-cpu-android-4-0.html
It depends why you carry a laptop with you, but many travelers would be able to leave it at home once they get one of these. For me, my work requires consultation over Skype video conferencing, so plugging in a webcam is essential.
There are some disadvantages. You can't just start using this in the middle of the airport because you need to plug into a tv. But I find that if you stay at a motel, or even rent a furnished apartment, TV's with HDMI/USB are available. Also in places like Korea and Japan, there are special study rooms / coffee shop hybrid places that have those TV's on the wall for you to do presentations.
At this stage in the development of these small PC's, you'll find yourself plugging in tonnes of peripherals.
What are your thoughts on this kind of computing? Does it work for you?