Though we at TIER are all resting (or writing disserations) over this summer period, our friends at Mobile Active (MA) have recently psoted a writeup of a trip TIER took to MA a month ago. We demonstrated OpenBTS and the Village Base Station, showed a number of potential GSM attacks on handsets, and made a call through a VSAT link. It was a great time.
Here's their blog post: http://www.mobileactive.org/village-base-station-project
The only addendum we have is: Don't try this at home. Operating in cellular bands is extremely illegal, and you're likely to damage the networks (limiting important services like 911).