How to get WPA2 to work in Windows. I believe it's only supported natively in Windows XP SP2 with the addition of a hotfix. WiFi equipment vendors may offer their own connection software that may work with WPA2...
I've got a DI-624 and wanted to use the more secure WPA2, but didn't know how to configure it properly on my WinXP SP2 laptop with the Dell TrueMobile 1300 WLAN 802.11b/g card. Don't give me the credit, I just found the following via google: http://www.dslreports.com/forum/remark,13878831?hilite=dwl-g650
The hotfix to add WPA2 to XP is found here: http://support.microsoft.com/kb/893357 (titled: The Wi-Fi Protected Access 2 (WPA2)/Wireless Provisioning Services Information Element (WPS IE) update for Windows XP with Service Pack 2 is available)
Here's a good white paper on WPA/WPA2 and deployment: http://www.wi-fi.org/getfile.asp?f=WFA_02_27_05_WPA_WPA2_White_Paper.pdf