Bill Curtis is right, I just found the internet also.
I couldn't resist, I broke down and got an ATT laptop connect card.. So far it works as advertised.
In particular I am really impressed with the ATT Wireless manager. It manages both GSM and 802.11 WIFI connections, plus its got some nice features I've not seen on other wireless managers, auto VPN initialization and ATT public wifi detection.
From what I can tell you don't need the GSM adapter for the wireless manager to still function.
High-Speed wireless connectivity for mobile devices | AT&T wireless services