I\'m looking for suggestions on Flash realtime servers. Currently, we use a combination of Moock\'s Unity and Red5, but there are a couple problems. First, we are moving to AS3,
Give Wowza a try! I've only used it for webcam recording, but the experience was very seamless, a far cry from Red5. Plus as a developer you can use the full Wowza for free AFAIK, so you don't have to take my word for it. It's easy to install, they have good code samples, it really gave me a good impression.
Another interesting fact is that Wowza is made by ex-Adobe/Macromedia engineers who used to work on FMS.