Haha, I just spent several irritating days trying to get my old D-Link DCF-650W card to work. It turns out that it wasn't supported. The file I pointed you to is the file that seems to let auto-detection scripts figure out what it is that's been plugged into the CF slot. It has WiFi cards, wired cards, memory cards, and random other things in that list. If it's not in that list, you're probably going to have a hard time getting it to work.
My recommendation is don't get a card unless you can find out what model number it is beforehand. That way you can make sure that it works before shelling out money for it. Not all cards from a particular manufacturer are supported, so if you just assume that a Linksys will work, you may find that you got one that really didn't.
You can do a search for a manufacturer's card in that config file by typing in "cat /etc/pcmcia/config | grep -i <search string>" on your Zaurus. That command basically reads the text of that file into grep who searches for that search string in the file and prints out every line where that string appears. The -i makes the search case insensitive so you don't have to worry about capitalization. When I searched for Sitecom I got no results, so that's probably a good sign to stear clear for the moment. It doesn't mean that it can't work, just that it will be hard to make it work. Good things to try in your search string are vendor names (though some vendors are typed differently like both "D Link" and "D-Link" are used) and exact model numbers like "DCF-650W" or "WCF12".
Here's a sample of what that command prints out for cat /etc/pcmcia/config | grep -i "linksys":
card "Linksys WPC11 11Mbps 802.11b WLAN Card"
card "Linksys WPC11 11Mbps 802.11b WLAN Card"
card "Linksys WCF12 Wireless CompactFlash Card"
card "Linksys LANmodem 28.8"
version "LINKSYS", "PCMLM28"
card "Linksys LANmodem 33.6"
version "LINKSYS", "PCMLM336"As you can see by that third line, my WCF12 Linksys card is in the file, so I know it's nice and supported by the auto-detection.
By doing that, you can search for and try to find out what models of cards are most easily supported.
I am no expert in Linux nor the Zaurus, but I feel like I have some idea what I'm talking about with the wireless cards. Of course, I could be completely off my rocker and I have no idea what I'm talking about, but that's up to you to decide.
