TaskPaper, from the developer of WriteRoom, has been around for a while, and we've been talking about it since version 1.0. After what seems like a long wait, TaskPaper for iPhone is out. The super-simple to-do list with surprisingly robust capabilities is now mobile, and syncs with the desktop version (through Simpletext.ws) for a complete task management solution.
The interesting aspect of TaskPaper is that it uses plain text files with minimal formatting to create and manage to-do lists. The file is easily read by other applications, and things such as tags and due dates are handled in a very human-readable format. The iPhone version offers the functionality of the desktop version, and the two work together quite well. Current users of TaskPaper on the desktop should note the format changes in TaskPaper files.