I noticed chat was missing "again". I think there were more people on chat before this last upgrade and it made everyone more social. The one that just disappeared has some nice features, but it really can't replace the one that was there before, and it is not compatible with some browsers. I would like to see a better chat client installed.
I'm not picky in general as long as there's some chat system. I noticed it was gone as soon as I logged in. I do understand needing a system that doesn't interfere with other aspects of the site, particularly if it's not getting immense use. I know I use it quite a bit, though for 1to1 more than the rooms. I do like the rooms too though as I've used those in spurts as well.