I'm also packing along my wireless mouse, as well as my Dell inspiron Duo. I still don't like the design but the is a Win7 tablet convertible. It still beats out all my other tablets in terms of sheer usefulness and I'm expecting to need it on the bus (every seat will be taken).
In terms of ereaders, I'm leaving behind the Kindle but bringing new ereaders. I just got a Libre Color from Aluratek as well as a pair of review units from Gajah. The Libre Color is staying behind, unfortunately; I'm liable if it gets stolen. But one of the Gajah review units is the new Libre Touch Android tablet, which should be fun to play with.
I'm also bringing my HP 360LX. I don't need it but I plan to start an impromptu weirdest gadget contest (and win it).
image by Haags Uitburo