One of my favorite new sites is SlimTimer. It's the best time tracker for tasks that I've found, either as a online Web 2.0-ish service or an offline installable application. SlimTimer offers a basic mode for free and premium services for a small fee.

I am hooked after using it for a couple of months. When I free up some project time, I am going to contact the author and see if he is interested in some collaboration opportunities. One thing I could help out with is a Windows Vista sidebar companion gadget.