Regular readers might have read my post back in December 2009 about an online To Do list. Well, in the end, TeuxDeux's simplicity killed it for me. I found I needed more space for descriptions, I craved for a calendar and the ability to post an item further into the future quicker than TeuxDeux's painful option, etc, etc.
So, as luck would have it, I stumbled upon a far more powerful tool, also free, of course: HiTask.
HiTask allows for more options than I care for, but what's important is that it gives me more space than I need for descriptions, I can jump ahead easily, I can set reminders and even schedule it to remind me by email, I can categorise my items, and a whole load more, which I won't go into here. If you don't believe it, check it out for yourself!