One thing that make the time tracking in basecamp almost useless for me is that I have to keep track of my time ELSEWHERE so that I can add it to basecamp, because basecamp doesn’t allow you to clock in / clock out. That seems like a pretty basic feature. I am surprised nobody seems to have brought this up (I come to that conclusion after both a Google search and a search of these forums).

See the Basecamp Exras page under both “Widgets” and “Time Tracking” for utilities to help you with this.

I use the excellent Project Recon for Windows all day long for this.