I have a HP 2215 and a Dell TrueMobile 1180 card. I am using MiniStumbler 4.0 and I am using the Orinoco Drivers. It took me awhile to find these drivers but you can get them here.
http://www.noodles4all.com/WiFi/WLCE3074.zip
If you get that card do NOT install the drivers that come with it. You will have to hard boot your PDA to get them off. And they suck anyway. Use the Orinoco drivers they are MUCH better in every way.
Here are some instructions on how to do it
1. Remove Dell TrueMobile CF card from your PPC
2. Uninstall the Dell TrueMobile driver (good luck you may have to hard boot so back up first!)
3. Install orinoco driver onto your PocketPC
4. Insert the CF card into your PPC
5. When prompted with Unrecognized Card, enter WLLUC46.DLL
It works great. I hope this helps others get started easier.