Present.ly lets you quickly set up a private microblog where you and your co-workers can enter short update
Present.ly is a micro-update communications tool for your company. It give employees the ability to instantly communicate their current status, ask questions, post media, and more. It doesn't require that all users are on the same e-mail domain. The name Present.ly means right now. Additional users can be added to any plan at a rate of $1/user/month.