The basic process is the same as for using iPass on OSX, except that for the iPod client there's no domain field. So this time the fields look like
- UserName: domain.com/username
Password: what the IT guys gave you
After you've put in your credentials in iPass, save them.
Then go to the wireless control preference and connect to the hotspot
Go back to iPass, press 'Login' and after a few seconds you should be good to go. You'll know you're in if it says 'synchronising data'.