I am sure you've addressed this, but all I could find were outlook references in regard to the iPhone app. Can I sync the iPhone apps to do list(s) with iCal? If so, how?
If you are trying to do a one-time export of your data to a calendar application, such as Google Calendar or Apple's iCal, you will need to select the "Download iCal file" option in our export section.
If you want to use Toodledo in conjunction with a calendar application, you can use the "Live iCal Link" in our Tools & Services section. The "Live iCal Link" is a one-way link that will send tasks from Toodledo to your calendar.
If you use Google Calendar, we recommend using our special Google Calendar Widget.