Long answer: Code it and publish it. Or at least elaborate on your approach and how it differs from the many existing solutions, such as the TaskPaper-format and todo.txt variants.
If you're really looking for design input, re-read the first paragraph and then we can help you with feedback.
Edit: release it, release it, release it, release it, release it, release it, release it, release it, release it, release it, release it, release it, release it, release it, release it, release it, release it, release it, release it, release it, release it, release it, release it, release it, release it, release it, release it, release it, release it, release it,release it, release it, release it
Trust me every time I commit I should scrounge more, imscan every word of a comment for signs of sarcasm, I still do it, I still hate it and I have become a better coder for the feedback frommthe work I pit out there. The benefits have outweighed the costs