There are a few that you guys missed that I find invaluable:
Visual Studio 2008 Express editions, invaluable for software development, whether you're doing .NET or C++ work.
VMWare Player, you can run many different types of preconfigured virtual machines and use it to test out any of your software development without affecting your host OS.
Tortoise SVN, lets you track each and every revision you make to any file you tell it to. Great for when you make a change and later on you want to revert/undo that change because you think you messed up somewhere and want to go back to a good version.
Filezilla, quickly and painlessly upload all your files to your webhost so you can get your website up and running faster.