Script Bar
by Seth King
Script Bar is a Widget that allows you to activate an application by typing its name (so long as it's at the root of your Applications folder). You can also send AppleEvents to an application.
You can pause iTunes, open every folder in your home directory, quit an application even if it's not active without the dock... or just making the computer say something without opening a text document and speaking it. The possibilities are endless, because AppleScript provides a lot of user control that isn't typically easy to harness, until now.