ePlanner is an easy-to-use personal project planner for keeping track of to-do lists or small projects. You can use as much of it as you like, and you are not forced to provide information you dont need.
ePlanner can handle actions, projects, and goals. Each item can have as many tags as you need, and you can also store short notes.
There is no steep learning curve, as you can start small and make use of the more advanced features later on.