My team has been using appear.in for about two years now (I introduced it to them smug).
http://appear.in/some_words_doesnt_matter <- share with whoever, instant video call
http://appear.in/some_words_doesnt_matter <- share with whoever, instant video call
But, the boss will see when you're "available" straight from Outlook, which is where he lives. It's not an IM tool, it's (yet another) instrument of workforce control.
Also, despite the rigid security policy where I work, the mac client stores my password in the keychain.