I really appreciate the simplicity of TeuxDeux. No advanced options or configurations. Just simple calendar based to-do lists.

Simplicity and excellent design makes it a joy to use

Lists without context are difficult to work. David Allen's groundbreaking productivity book GETTING THINGS DONE taught us that. Context is what makes the difference, whether it's by project or context or some other way to put "hard edges" around a list. In other words, what you DON'T want to do is comingle these things. It yanks you mentally out of context if you have items for the workplace mixed with stuff like, "clean the garage." TEUXDEUX gives you a visual way to see your tasks separated in this manner. The TOP region organizes actions according to DATE, like a weekly calendar. The BOTTOM region is the staging area, where you can create an unlimited number of these distinct lists, arranged visually as separate columns. You can have one for Work, one for Errands, or whatever you want to name them. Best of all, it's spartan and attractive and easy to use. Try it for yourself and see how you like it!