Tis an old thread, but certainly caught my attention. Perhaps I may pitch in my $0.02..
With the new trend of "social media", I think adding a chat to a blog / website is a nice way to reach out to your audience and also build a community around your site.
It's also a good way to "get to know" your audience through small talks, especially for a blog.
One good embeddable chat I'd recommend is Chatroll (
http://chatroll.com). It's a community of "live forums" that also serves as embeddable chat.
Here is another article about it:
http://blog.chatroll.com/how-to/add-...n-3-easy-steps
The only drawback (or advantage?) is that its not flash based. So it can't nicely integrate into a site built on flash..
Cheers!