Just a quick note to say we've just launched an Arduino board called the RockBLOCK, a low-cost two-way satellite messaging unit which can be easily integrated into Arduino projects using USB or serial interfaces. The RockBLOCK allows short messages to be sent and received from anywhere on Earth.
We're looking for interesting projects where we can give away some units - do you have a project which needs two-way comms and you're going out of mobile/cell coverage? Get in touch and let us know, and if it's interesting enough then you can have one. (note - our version of 'interesting' might be different to yours!!) 
Designed for educational, hobbiest and professional users alike, the unit is the ideal way to provide a way of globally communicating with projects using Arduino, and almost any other system with either USB or serial ports.

The unit combines an Iridium 9602 SBD modem, USB interface, power-handling and a high-performance Iridium antenna – it takes away all the hassle of integration with other devices and makes two-way satellite communication plug-and-play for the first time.
Easy two-way comms with autonomous robots, remote weather stations, oil pipeline monitoring, oceanographic research - especially where your projects might go out of normal methods of communication, such as mobile phone networks etc.
More info at
http://rockblock.rock7mobile.com