Ok, I have done a lot more digging.
Linksys WCF54G Wireless Compact Flash was the first ever CF 802.11g card, never knew that, it was just cheap on ebay.
Chipset is Agere
Agere provided open source drivers but, I can see no reports of getting this card working and they were taken over and the official links are all dead.http://www.agere.com/mobility/wireless_lan_drivers.html
Drivers *may* be kernel 2.4 only.
Lots of people (over the years) have asked for help getting this card to work but nothing I can find says "do this and it will work" on any zaurus distro.
Possibly supported by Hermes II
Possibly need wlags49 driver/s
Best hope is a post by speculatrix Jun 7 2005post
<plead>Any update ?</plead>
Really need to find someone who has wholeheartedly got this card work in the Zaurus and can explain what needs to be done.