Chinese manufacturer Hott is launching a design for a 4.8" tablet based on a version of Android which they have customized to work for them on the ARM9 Rockchip based processor which comes with full video playback support. Check out these interesting Android customizations in this product that they proudly define as "iPad-killer".
The design of this 4.8" Android tablet by Hott is the most compact that I have seen so far. I think it is very nice that it only has a minimal screen bezel. Check out it's size compared to my Archos 5 Internet Tablet with Android in the following pictures posted to Picasa (click to see the full size versions on Picasa):