Chat application AJAX polling

Question

In the project I am currently working on, we have the need to develop a web chat application, not a very complex chat, just a way to connect two people to talk about a very

Answer 1

I agree with John. But there was another question that was not answered.
I have done this but instead of using a database we used a flat file, it did eventually cripple the server, but it wasn't until we has ~450 active users, and if we had done it with a database it probably would have fared better.
This was done on a basic hosting account from Godaddy.

Edit: BTW Godaddy sounded less then amused when I got the phone call.