I've just noticed that eXpansys are taking pre-orders for the Sharp Zaurus SL-C700, a 400 MHz xscale device with a 640x480 screen that can be used in Psion-like clamshell mode or, thanks to some magic hinges, a la Palm. Runs Linux, of course. It has CF _and_ SD slots and can take an 802.11 CF card. Many of the programs developed for the 5500 apparently work on it and I've seen a web-site with pictures of a John Wayne movie playing on one. (OK, so not all owners have good taste.)
Some of us have been drooling over this PDA since its announcement last November in Japan but this is the first time I've seen a UK-friendly version available. No price yet, alas, but I've already placed my order.
At last, I can replace my aging Psion 5 with a palmtop that I should be able to get emacs onto! ;-)
http://www.expansys.com/product.asp?code=SL-C700
for more details.
..Adrian