The N800 is a small tablet type device produced by Nokia.
It has a 320Mhz ARM CPU, 128MB of RAM and 256MB of flash storage. While the latter sounds small it also has two card slots allowing plugging in lots of extra storage. The display is a nice 800x480 and about 4 inches. It has both 802.11b/g and Bluetooth 2.0. A built in camera is also included.
The browser is open source. Links to the source and other stuff here.
I don't have one, but being a gadget person I have to say I'm now quite tempted! Time to stop reading about it...