Only a day after the release of BlazeDS, Nicolas Cannasse (Motion-Twin) has just released haxeVideo:

haxeVideo is an opensource video streaming server entirely written in haXe
Features include :

* FLV streaming using RTMP protocol
* Webcam and Microphone recording to FLV file
* Live streaming for web conferencing
* light and fast scalable server
* only 50 KB of server source code : modify whatever you need !

Finally the multiuser/conferencing thing is taking place?
We will ever see affordable (T)RTMP hosting services?

PS: This can be the right answer to those interested in a web-radio solution