I was looking for a way to add stories to Pivotal Tracker without having to load their UI in the web browser. I wanted something as fast as using Alfred, and found Jelle Vandebeeck's Pivot App for the Mac.
Pivot puts an icon in your menubar, and drops down a form to file chores, features, bugs, and releases with auto-completion for projects, owners, and tags. Simple. Only thing I could want more from this is a clipboard link to the story, or an optional description field, but is otherwise near perfect.