I don't think MobileMe is set up for task management at all, so I assume you are asking about syncing Toodledo with your MobileMe calendar. I don't use the service, but they more than likely allow you to subscribe to online iCals, and Toodledo has an iCal service you can use: http://www.toodledo.com/connect_ical.php
It will put all your tasks with dates on your calendar as events, but it is a one-way sync so you can't edit them from your calendar. If you can't find a way to get MobileMe to subscribe to the calendar, you could subscribe through Apple iCal, or Outlook if you sync either of those with MobileMe. You can also just add the Toodledo calendar subscription to your iPhone calendar directly by clicking on the "webcal://" link on the setup page from Mobile Safari.
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