This is without a doubt the best to do list program I have ever used. It opens easily and fast, allows me to review tasks by type (phone calls, meetings, errands, etc.) or by day, or importance.
The developer is wonderfully responsive. I had the little problem too of it crashing when I marked a task as completed. He very obviously paid attention to my difficulty and emailed me a fixed version as soon as he had it.
I would give this five stars.