First, left click the Networks icon near the date.
From the menu which is displayed, click "Connect to Other Wireless Network..."
Enter the name UANA, and then select WPA2 Enterprise from the Wireless Security menu. Many, many options will appear.
For EAP method select TTLS.
For Key Type select Dynamic WEP.
For Phase2 Type select PAP.
For Identity type your username.
For Password type your password.
If you have a CA Certificate (probably not, unless you made one or a friend has one from Windows, see previous post) select that for CA Certificate File.
Click connect.
Connected! Of course, you don't have a direct connection to the internet, so set up Proxy settings (for Firefox, click Edit > Preferences > Advanced > Network > Settings and set Manual Proxy Configuration with HTTP proxy of proxy.utas.edu.au and port of 8080).
[2008-May-10: Tested, 7.10 is fine. However, doesn't work well with hibernation, requiring a reboot or such to reconnect to the network; also doesn't reconnect if previously set up a UANA connection incorrectly, requiring the deletion of the UANA settings and then re-entry of details]
Thanks to someone for demonstrating how to connect to UANA... I'll remember your name next Tuesday :-P