Have a new idea?
The CATEGORIES field within each VTODO entry in the "All lists" iCalendar feed could be filled with the name of the list each task is under (Personal, Study, ...) (right now the exported VTODO entries don't utilize this field). This would make it easy for calendar apps to distinguish (e.g. show in a different color) between the lists without needing to subscribe to a different feed for each list.
Posted at 4:30pm on September 22, 2009