Actually, there are many interesting things related to the Ben NanoNote:
Tuxbrain started to produce wireless cards for the NanoNote. They are not WiFi but there are versions bot for the NanoNote and for Linux computers (software support is not finished, yet but if works is some way).
There is also another extension – a UBB-VGA card by Werner Almesberger (he is also the author of the wireless cards). It can be very practical for presentations from the NanoNote.
Full documentation is available so anyone can built. Unfortunatelly, soldering is not my hobby so I haven’t tried to build this card, yet.