Well, I'm unable to edit the OP, so I'll just put this here.
Socket (WebSocket version) - Download 1
<img src="http://dl.dropbox.com/u/551734/dev/c2/plugins/socket-websocket1.png" border="0">
The WebSocket version of the Socket plugin works using WebSockets, a new HTML5 standard. Unfortunately WebSockets support has been dropped by Firefox and Opera because the specification was flawed, so this version only works in Google Chrome and WebKit based browsers. You can enable WebSockets by command line though, if you want to play around with it in other browsers, google it.
Obviously due to the fact that this is a socket you need a server on the other side to communicate with. This version of the Socket plugin supports normal WebSocket servers. If you google 'WebSocket server' you'll find a server that works in a language that you like, and then you can program the server-side stuff.
I've included an example .capx in the download. This example connects to the echo.websocket.org server, which sends back anything that you send towards it. When the 'Echo test' message pops up (at least it should if its working), that means that the echo.websocket.org server has sent back the 'Echo test' message that the socket in the example sends towards it.
Socket (Cross-browser version) - Download 1
<img src="http://dl.dropbox.com/u/551734/dev/c2/plugins/socket-io1.png" border="0">
Unfortunately, Socket.IO has a rather limited amount of servers you can use. I suggest Tornadio, which is an extension of the Python module tornado. Its the module I used to write the test echo server in. The server.py file is also available in the download. You should note, that in order for Flash sockets to work, there also needs to be a flashpolicy.xml file with the server which has been included as well.
I'm not too sure about Flash sockets as well, I believe that they will work however if you can't get them to work try including the WebSocket Flash (.swf) files included in the download.
All in all, it should work nicely. I've written a multi-player game before with the Socket.IO library and I got it working in Opera. If there are any issues with this version, just post them here and I'll try and fix them.