I must second WorkFlowy. I've tried lots of different managers, but WF is the only one that worked for me. It's flexible enough to support the simple, no-frills

I must second WorkFlowy. I've tried lots of different managers, but WF is the only one that worked for me. It's flexible enough to support the simple, no-frills to-do list as well as the larger projects. I like information hierarchies and WFs free-form style and zoom levels are perfect for me. Not being happy with any of the other tools I tried used to make it a pain for me to keep things organized, but WF changed all that. Try it!