This is libicd-network-wpa, an experimental icd plugin that uses wpa_supplicant to connect to (not only WPA) Wi-Fi access points.
This is still an alpha, and probably it will ever remain as such since I can't think of a better, cleaner way to do what it tries to achieve, unless you add new hardware or drivers to the mix. So, I'm of course happy to accept patches or ideas.
The following assumes you have OS2008 and the Diablo SDK.
My suggestion is that you clone the git repo (preferrably a stable tag), and read each of the following steps carefully:
This patch was not done by me (search maemo-developers list to find the author); I just adapted some of wireless extensions functions to match what the original libicd-network-wlan (which is closed source) expects. This allows both a patched wpa_supplicant and the standard Maemo utilities to cooperate on the same system, with nearly full functionality.
This implements a special dumbed down mode in wlancond used by libicd-network-wpa. I don't know why I did this. Probably because I though I would get free powersaving and other nice features, but I didn't. So I guess a future version may remove this, or may not. Either way, for now, you'll need to patch.
The library should hopefully build with a simple make.
TBD