Tungsten C is the only one with capable via a wifi connection. All other Tungsten's have to be connected to a phone via Bluetooth.
The T3 can have a WiFi connection via an expansion card. This will also work on the Zire 72.
The only option that PalmOne has of connecting to the internet without a network or wifi connection would be the Treo Smartphone.....not sure if it will do full html though. I believe it's new browser will but haven't seen it in person yet.