Stuck in a project site with a VSAT at the office and nothing in the guest house which is only a couple of hundred yards away? Never fear! Just hook-up a Ubiquiti Networks Bullet and to any old antenna, jack the other end into an Ethernet port, and you are good to go. Ubiquiti also makes AirOS to make management of your system (relatively) simple.
UPDATE: Be sure to read Sam Churchill’s take on it over at Dailywireless.org.