I'll second that! Terrific app. It also syncs with Outlook and then I sync Outlook with a web app called Toodledo which gives me my tasks on my iPhone. MLO currently has an iPhone version underdevelopment, but who knows when that'll be out. I used to use the sync over FTP to use at home and work, but now I just use DropBox. I save MLO's .ml file to my DropBox and then I can access my tasks anywhere I have MLO installed.

This is about the best desktop task manager I've run across. Hierarchical tasks, powerful prioritization, very customizeable. XML output and syncs with MindManager. Track projects or tasks, assign to multiple contexts (categories). Presents an outline view and a todo view. Only think missing is a calendar view, but the todo is customizeable to the point where a calendar view is not completely necessary.