(Update: some people come to this page because they are searching for a Raspberry Pi which is an access point. There's info on this at the R-Pi blog.)
I went to the Gadget Show Live on Friday. I saw a real Raspberry Pi at the Centre for Computing History Stand. It was a production board, but they were also donated Beta Board #7 by an anonymous donor. More details in the forum. Their stand was near a stand for an radio controlled car company which was popular with my children, so I went over a few times. There was always a small crowd gathered around it.
I saw another neat gadget which a colleague of mine has bought - a tiny wireless access point. It can also operate in "Router, Bridge, Client and Repeater modes". The signal only covers "the average sized room", but for £15 it could easily find a number of uses, like a SAN if you plug in a USB flash drive.