For what it's worth, I went through a lot of web research -- on my own time -- recently to improve my method for tracking time for multiple projects and activities. After several options I've settled -- for now -- on the "Cratchit.org Time Tool." It most closely mimicks a *nix utility called KArm but, hey, since Revit >> Autodesk >> MS >> Windows, it took a bit of looking around for a Windows equivalent. Hope someone finds it useful:
http://www.cratchit.org/TimeTool/index.htm
It's free -- as in "free beer" and "free [open source] software" so no money now or in the future. See http://www.fsf.org/licenses/gpl.html for definition of all that...
jk