Suggestion of best practices for implementing a Web Chat

I want to develop a g开发者_开发百科ood chat in my page, I know how to program in php, actionscript 2 and 3, and how to manage MySQL databases.

So, given that I know to program, what do you suggest? Any good tutorials for making one? good open source projects? Implication of using this technologies in chats?

I would recommend you use IRC - this way you don't have to worry about the server aspect.

Also, you should take a look at this Ajax-based IRC PHP Client:

http://ajaxian.com/archives/mibbit-ajax-based-irc-client

Take a look at this for how other people have implemented something similar. Perhaps consider an IRC backend to avoid creating your own system.