I thought to share with you the problem I face when I search my task in remember the milk.
If I search my task by using top search field, the search text remains there. To clear the search result , I need to click the dropdown, remove the text and hit the search button again to get my original task-list. I think that it would be easier if you can provide a new button to clear/remove the search field and shows the unfiltered list of task.