I contributed my experience with Vonage to this thred, but it's funny to see how many deep technical folks use airstreams. Great conversations about packets, gives me shivers
The comment on 256kbps uplink is interesting since most of the sat broaband providers only have 128kbs uplink. That would rule out using a satelllite broadband provider such as hughes. So unless you have a campsite or hotel that provides good quality broadband you could be in a challenged situation.