An Amazing, Free To-Do List Manager

Shortly, I'll post something longer about Web 2.0 applications, web-based software, software as service and all that. Meanwhile, I want to recommend an online to-do list manager called Voo2Do. It couldn't be easier to use, includes all the essential fields including prioritization, deadlines and estimated time to complete. You can add categories on the fly as you add items, and it automatically reorders the list according to due dates and priorities as soon as you enter them. Very impressive. And did I say it's totally free?