I am the main Blackberry guru here in my company. We have about 200 Blackberries deployed, mostly 7280s, a few 7290s and we are not seeing the 7100G. We have the BES admin who take care of the server and putting people into the proper groups (We are a Lotus Notes shop) and then Desktop Support (primarily me) who troubleshoots them. There are 4 of us in our team and we can all setup the Blackberry (728 and 7290) and give a tutorial on how to use it. However, I am the only tech that can install/support the 7100G and do support for the 7290. Seems like the rest of my team doesn't want to learn the 7100G or 7290 (I'm talking Bluetooth support mostly for the 7290 as the device itself is pretty much the same).
Our HelpDesk does not have Blackberries are are clueless when it comes to troubleshooting these. Well, then again they don't want you to call in with a problem.
When we deoply a new Blackberry device, we also give them a Blackberry tips guide that contains basic troubleshooting tips and some shortcuts. It's helped us out with the amount of Blackberry specific calls we get.