A well interesting article on as to use Flex 2 with Flash Media Server, is a simple example but of the one notion of as to use the class NetConnection and NetStream in Flex 2 and to feel some differences in the Action Script 3.0.
link of the article: http://flash-communications.net/technotes/fms2/flex2FMS/index.html
See the application working
14/03/2006 *** UPDATE ******
I found another article on Flex and Flash Media Server written by Christophe Coenraets, very good for signal!
Link of the article: http://coenraets.com/viewarticle.jsp?articleId=98
Link for the application
For to see the examples is need to have the Flash Player 9
To know more: Programming Flash Communication Server
http://flash-communications.net/index.html
Adobe Labs http://labs.macromedia.com/
Leonardo,
There is also a nice article about Flex w/ FMS for video conference. You can get the link to the article here off of the author’s blog:
http://renaun.com/blog/2006/11/08/147/
And the view a live demo and download the source here:
http://renaun.com/blog/2006/10/28/139/
hth,
g