Just finished setting up my desk at FreshMuse and I thought you might like to take a gander at my setup. It is a pretty fun quad monitor setup! Here are the specs:

• The Brains: MacBook Air
• The Twins: 2 Samsung SyncMaster 2333 monitors that run 1080p
• The floater: 1st Gen iPad running AirDisplay

Yes, the iPad is a fully functional 4th monitor. The beauty of AirDisplay is that it runs over wireless, so I have a portable secondary monitor no matter where I am!