Hi good people of kirupa!
It’s been a while since I posted on kirupa so sorry if I am posting this in the wrong forum. If so I hope an admin would be nice enough to move me where I belong!
When that is said we just released a new Multiplayer API over at www.player.io and I thought it might be great for the ActionScript 3 developers here.
The API is similar to that provided by other sites, but offers full control over your lobby, chat, branding and users. (Basically everything)
To help you get started I have written this getting started guide.
I do however imagine a lot of people would like a complex example so I started this open source project: http://code.google.com/p/multiplayer-asteroids/
The actual game can be tried here:
http://www.kongregate.com/games/QRious/multiplayer-asteroids-2
As the site and API is brand new, all feedback, comments, suggestions etc would be much appreciate!