I made a post about it some time ago on here, and at that point the poster asked for the opposite (not too simple).

You can find it here: http://news.ycombinator.com/item?id=1108498

I have since added a few minor details, but largely it's the same. I still feel a bit bad for ripping off their design, but heck, it was just up my alley. But in all honesty, it sounds like http://teuxdeux.com/ out of the box would be just your thing. Personally I wanted to be able to have it stored "locally" where I had full control.

And to answer your question: I use what is outlined above and it works really well for me. The only drawback, perhaps, is that my "To do Some day" list has gotten pretty big. Everything I can't do right now but find interesting, or every little idea end up in that container. Not sure if that's entirely bad, though.