Wakoopa is an online service that offers ability to track your app usage, share it and get updates from your friends about the apps they use. This is done by the little piece of software that sits on your computer, monitors your usage and sends this info to your online profile. The software is available for Mac, Windows and soon for Linux.
There are three things that make wakoopa very appealing. The first one is that wakoopa is a great way to monitor your productivity, evaluating how much time you spend using particular "productivity" apps and how much time you spend on social sites and just goofing about. The second thing is that wakoopa is a great tool to keep the track of interesting apps. Watch the recommendations, download them and try the apps yourself. Last but least, is the ability to share your apps with your friends, see what they use and what apps they have discovered. Of course, wakoopa offers privacy functionality so if you prefer to keep you usage private you can do that.