The chat search function seems to be quite limited. For example, searching for "ask different" produces results where the post contains either "ask" or "different". As these are very common words, it's virtually impossible to find anyone referring to the Ask Different site. Putting quotes around the phrase also seems to have no effect.
It would also be nice if it were possible to exclude rooms from the search - when I'm searching for "Ask Different" in the chat, I'm looking for references to the site from other chat rooms, not the Ask Different chat rooms, and excluding them would make sifting through the results easier. In a similar vein, it would also be useful to exclude users from the search as well.