I think there is some movement on this board to give users more control over deleting or editing goals, but I wanted to point out that your current lack of an interface for these things is actually a bit of a feature. It makes you think twice about what goals you create (commit to). For instance, I have a dud email goal hanging around, I set it to end in a week and I hope it goes away, but as an end-user I don't know if it will and it makes me more careful about creating goals I don't want or failing at goals that will stare at me. So, if/when you implement a more robust interface for creating, deleting, and modifying goals, please keep in mind the merit of this stickiness in both increasing my commitment and enhancing the filter with which I judge my priorities. I would recommend that with such an interface, also keep immutable account statistics--number of goals created uncommitted, the number of goals failed, etc. If not completely immutable, make it all or nothing, "Are you sure you want to delete ALL of your history? Success history will be lost too!" This long-term accountability will help as much as the short-term accountability of specific goals.

Admittedly, this idea is not clear cut or well refined. Please vote me up if you agree on the general notion, and argue the details in the comments.