SmartWindows.app - Auto arrange all your app windows, whether on one screen or many with a single click!
KeyCastr - KeyCastr lets you easily display your keystrokes while recording screencasts.
Accelerated - Online community to break into tech & VC
Carnac - A utility to give some insight into how you use your keyboard/
VC Starter Kit - Everything you need to look like a Venture Capitalist
Key-mon - Utility to show live keyboard and mouse status for teaching and screencasts.