OK my 1st list:
Port over a comics/manga
reader.
Offline HTML browser/reader, any of
these (the smallest I guess)
Online HTML Browser like
this
Now we go into the stratosphere
any one of the following:
Linux driver for a Bluetooth via USB, and/or USB WIFI and/or USB CDMA modem...
I know not for this device, but after that wireless card hack on the Iliad I was hopping for something comparable eventually