Midnight Inbox is an application meant to enable users to follow the GTD methodology easily on their Macs. All of the "steps" of the process are represented by a very nice UI. The app's main window is a bit large, but can be minimized if you don't mind a good deal of scrolling.
This week version 1.1 was released. Changes include:
- SQL format data storage
- iCal synchronization for external devices
- Documentation in OS X's help menu
- A new archive feature