The iPad, like the iPhone and iPod touch does support 802.1x network. You can edit these setting using the iPhone Configuration Utility found on the support website.
Unfortunately, because of the Wifi issues the iPad is experiencing it doesn't seem to work on my iPad. I'm not sure this is the case with everyone, it might just be me.
I've seen that the iPad supports 802.11 a/b/g/n but does anyone know if it is capable of transmitting on the 5GHZ band? We have major interference issues at a client site and have had to move to the 5GHZ band in order to get any kind of reliability.