One problem I see is your sorting does not work properly.
I sort my lists as follows:
First: Due Date
Second: Priority
Third: Alphabetical
The Due Date & Priority seem to be sorting properly.
However the Alphabetical sorting is not & seems to be somewhat random.
The Toodledo website sorts in this order:
1st: Special Characters (For Example - !, #, $, &, * , ...)
2nd: Numbers
3rd: Letters
Can you correct this issue in future versions?