If you use CARROT to do, this is an excellent add-on. It integrates beautifully. But even if you arent using CARROT To Do, this is a great app to see what youve done, and the last time youve done it, reminding you that maybe you should do it again soon.
whyanickname.thisispissingmeof about Recur! The Reverse To-Do List, v1.1