Mac OS X only: Midnight Inbox is swanky beta personal organizational software that implements the popular Getting Things Done personal productivity method.
Collect, process and organize your projects, tasks and life goals David Allen-style all in one interface. This is the first public beta release, and the developers warn against entering mission-critical data into it in this state. Even so, Midnight Inbox looks like a fabulous option full of potential for folks who don't want to mod Outlook/Entourage or their PDA to GTD; the system's already baked in. (Oh, if only there were a Windows version…) The beta Midnight Inbox is currently a free download, Mac OS X only.