It's really comforting to know that I'm not the only developer in the world that has to try out every tool in existence! Scott Hanselman recently updated his Ultimate Developer and Power Users Tool List for Windows.
If you're a software dev ensure you're aware of every tool on the list, even if you don't install them. Seriously.
Also be sure to check out the Hanselminutes podcasts, which are always chock-full of great tips.
If this seems like a Hanselman love-fest it's probably because it is - Scott is a guy I respect and admire. Love ya work Scott, keep it up!