I just signed up for Toggl and I am tracking time on a couple of projects that I'm working on. At first glance it's a pretty straight forward ap, easy to sign-up and easy to get going. One caveat, if you are in the middle of a project and you would like to include all of the time you have already spent on the project, you can't do it on Toggl. The free version only tracks time from the moment you sign up forward. After a month or two tracking with toggl, I hope to add a little more to this review.