Media Server

Wowza Media Server for Amazon EC2 Quick Start Guide
http://www.wowza.com/forums/content.php?191

Register a Trial Account
http://www.wowza.com/pricing/trial

LiveStream is using Wowza as backend
http://www.livestream.com/

TV Catchup is using Wowza as backend
http://www.tvcatchup.com/