It's not big...but bigger than an iPhone: 5.6" X 3.0". It does videos, MP3's, maps (but does not have GPS built-in), podcasts, as well has FM radio. It even has good sounding stereo speakers, a so-so camera and 2 SD card slots. Currently I have over 3GB of storage on it. There are quite a few applications, games, etc being ported from other Linux environments for this device so there is plenty of ways to use it. But mainly it works great on the web.
The small size is the big selling point when it comes to TD camping!