I just realized that Scott Hanselman's 2007 Ultimate Developer and Power Users Tool List for Windows has been updated for more than a week.
I'm a big fan of this list and whenever I'm in a need for a new tool I first check here. Also, lots of tools Scott finds are already in my toolbox.
If you haven't read through older list, you definitely want to do just that. If you saw 2006, just browse and check the red entries - those are new.