1. Use will die down over time as people won't want to browse with it running constantly. Perhaps you could create Chrome/Firefox addons with acceptable privacy policies which just popup a notification or display something in your status bar if you access a page with users that are chatting? Just to remind you that the functionality exists...
2. I just saw someody create a room with the same name as another room. They couldn't see the room I had created...
3. A little slow currently perhaps due to the number of users. Maybe that's just my machine.
4. Was surprised to see that everybody dropped trying to sound clever as soon as chat is realtime. Is a reputation system needed always?
5. Some way of bringing conversations back which you've closed...