I'm intrigued by a new iPhone app called Captio whose only purpose is to send yourself an email quickly.

I'm considering using it for RTM, since adding tasks to RTM on the iPhone is a multi-tap process.

Which makes me think… is it possible to mimic this functionality in the RTM app? Perhaps the app could assume that you wanted to add a task on launch. If you want to view your tasks (a single tap could bring you to your default list).