FWIW, I decided on the Buffalo WiFi CF card, as I\'d heard it worked well, it\'s not particularly large, and it was one of the less expensive cards I found.
The Buffalo seems to perform well, though I haven\'t compared it to any others. I would recommend this card, with at least one caveat: if you can, check the model number before you buy. There are at least two Buffalo WiFi CF cards out there; the WLI2-CF-S11 (which I bought) and the WLI2-CF-S11G (which seems to be more widely available). They both work fine with the Z, but to get the WLI2-CF-S11 working you need to edit the /etc/pcmcia/wlan-ng.conf file, to add the card\'s details.
Hope this helps - I\'ve been satisfied with the Buffalo card, but others\' mileage may vary.
Tim