Gordon,
 
My main intent is to support wireless in some form, ideally 802.11, with a Gumstix borad.  That being said, since there are currently no Linux supported SDIO wireless WLAN cards, and USB is out, I've been looking at alternatives.
 
It looks like the PXA255 architecture supports CompactFlash/PCMCIA with no additional hardware needed (aside from the port).  Was your decision to limit this functionality due to space concerns (obviously the CF port won't fit on the Gumstix board), or for other technical reasons?
 
Would it be feasible to create a Gumsitx with those ports exposed, or a daugher board to support the approprate pins?
 
For my application, the power-draw isn't a big concern, but wireless range and overall system cost is a big factor.  That eliminates (perhaps) bluetooth and other wireless solutions like "wireless RS2332" (see http://www.abacom-tech.com/downloads.htm).
 
I really like the (elsewise) low power draw of the Gumstix board, the fact that its a SBC with such an itty bitty form factor, and you're adding linux support from the get-go.
 
Thanks,
    Johann