I too use Toodledo, on the iPad and web. I have even used it collaboratively to track tasks with my virtual assistant. It's got complexity (you can organize tasks by folders, goals, priorities, status, and more) but if you're not overwhelmed with all the options, you can use it for simple list making. It feels very much like a personal effort by a single developer. It runs well though the interface is pretty much lists and boxes, not design art.