One thing I was asked to do recently was to deliver some training to the sales staff on the mobile data technologies currently available: to summarise the technical differences behind GPRS, EDGE, UMTS, HSDPA and the different services that can be delivered using them. I'm glad to say the training was well-received :). I created a handout for the sales guys, which you can download in PDF format here:
https://system.netsuite.com/core/media/media.nl?id=4485&c=519425&h=28318c008a18d3946b3c&_xt=.pdf
I hope you find it useful....and if you believe there is anything technically inaccurate in there, let me know!