One of my favorite apps, that was worth the time to share with the blogsphere, is WinKey. It is a very simple little freeware app that lets you assign commands (win apps or console apps) or folders to that handy little Windows flag key.
Being a keyboard junky, I love this app. I assign my most common apps to the keys, like Win-X for Internet Explorer, Win-C for the command prompt, Win-W for my text editor, and Win-Ctrl-B for my blogging app. I use Win-Ctrl-D to open my "Dump" folder where I move items to to keep my desktop clean.
I've written a number of apps that I only access through WinKey, using it as the hotkey for my app. It saves me from adding the code to my apps to put an icon in the system tray, UI for the user to select their key of choice, and managing the windows message handling for the keystroke.
It it just a little .exe, so it is helpful to add a shortcut in the Startup folder to run it minimized at startup.
My WinKey Settings