When chat is added to the various stackexchange sites is it to be used for general discussion of the topic, or only for meta discussion?
This is relevant to how search should work with respect to chats.
It is for general discussion of the topic. As I understand, there will be 3 domains to each site:
http://chat.meta.stackoverflow.com is the exception*, as MSO is not really a meta-site for Stack Overflow, but the meta site for Stack Exchange as a whole.
*i.e. I do not believe there will be any other chat.meta.example.com sites