For those of you (at least the Windows users) who have been living under a huge rock and still don’t know what Google Chrome is, it’s just Google’s own web browser. Go download and install it if you haven’t yet.
And for those of you living under a smaller rock and don’t know what the heck is the Incognito Mode in Google Chrome, basically it’s pr0n mode for browsers. What that means is that Chrome will manage pages loaded in Incognito mode separately (including separate cookie management) and clears cookie, and download and browser history upon exit.
Since it handles cookies separately, that also means that you can load two sessions of the same service and log in via separate accounts for each window. Well, this isn’t too different from launching a Firefox window and an IE window but at least you’re just running the same application.