A friend of mine bought this for his ipaq but never really used it. Current price new is over 100 pounds:
Item is boxed, with CD and CF-PCMCIA adaptor, with CD/driver for windows mobile. It doesn't include the optional battery pack. I think it might be missing the headset, which allows you to use it for voice calling, but these are only a few pounds (as far as I know its the same universal headset as used by the Audiovox card as well as various Treos - four-pole 2.5mm jack)
I've tested it in my Zaurus and it worked very well with VirginMobile - I used command-line to start pppd as I broke qtopia dialler in some way.
I can vouch for the item as I borrowed it only recently to compare against my audiovox, and would be buying it myself if only I weren't contemplating getting a Nokia E65 to get 3G + quad-band gsm.