Nice idea and would really be a handy tool, but it needs work. Ideally, I'd like to see this as a Menu Extra instead of an application though. Right now it does not maintain the history through a Quit of the application. Also, it prompts you every time to work offline vs synced online, every time the application starts. That should be a preference setting, set once and not asked each time. It should also maintain clippings for other items other than just text, as well.

A nice start for ver 1.0.