A few days ago, I started Plurking, which is like a cross between a graphical IRC, Twitter, and micro-blogging. The day before yesterday, I signed up with Brightkite, which allows you to tell (or not tell exactly, depending on your settings) your exact location, from where you’re posting from. It can be very useful of course but needs to be used with care.
Do you really want the boss to know where you are all day? Perhaps not!