Looks like I've missed something because Socket recently (according to their website they did on 05.05.) released a first version of its Windows Mobile Smartphone compatible SDIO W-LAN card driver.
However, according to the file description, the driver is designed to work with the Sagem myS-7 Smartphone, even if it installed fine on my i-mate SP3i (which I can not use for W-LAN since it uses a miniSD card under the battery):
Sagem myS-7 driver and Utility
This is the first release of the driver and utility for the SDIO WLAN card to operate on a Sagem myS-7 Smartphone. Please view the release notes within the .exe file.
Nevertheless, if you have a Sagem myS-7 (also known as Mitac 8870 and Medion Smartphone) you can start your wireless experience immediately; if you have an older HTC Smartphone like the Orange SPV/SPV E100/200 aka i-mate Smartphone and Smartphone 2 - I would like to hear from you if and how it works for you too.
Sagem myS-7 photos courtesy of Mark van der Horst.
All you need is Socket's SDIO W-LAN card and the new driver.
Cheers ~ Arne