Clever ToDo has the "best" live tile for task apps. Shows your next three tasks, plus due and overdue counts. No sync with Outlook but there is a backup/restore function. The app has a few quirks, like when it moves tasks from next to today, but the dev has an update in the works that should be out soon. WinMilk was my previous favorite (sync w/RTM-Outlook) but no live tile till at least Mango.
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