Here is quite a good site on the Iridium 9500 data kit.

http://www.highspeedsat.com/iridium-9500-motorola-data-kit.htm

Internet access is about 1/5 the speed of Dial-up so is very slow. So if using this SAT IP connection for Internet access web browsing it would be best to use WAP protocol web sites stored as bookmarks on the computers browser. (last thing you want to be doing is paying to download someones advertising)

Plain text email would be workable and even small highly compressed photos can be sent/recieved such as you would have for picture SMS. Iridium SMS messages would also be an easy to use and convenient alternative.

http://messaging.iridium.com/