That reminds me: It would be nice if you could open several different incognito windows, each with their own session. That way one can debug user interactions without needing as many browsers as users in the interaction (or half of it because each browser has it's own incognito session in addition to the normal session).
A workaround that I've used before is to connect to my site via the domain name in one tab, and the IP address in another - cross domain protection ensures I get two nicely partitioned sessions.
