How can I delete projects?

We currently don't have a way to completely remove projects. You can go in and mark them 'inactive' or 'closed' and that will keep the project items off the dashboard and task lists -- essentially make it invisible. Also, closed projects don't count towards your plan project limit. There is too much danger at present in deleting projects. However, if you are just testing things and would like me to clean up something in your account, just let me know what you would like removed and I'd be happy to do that.