That looks really cool, especially that you can use your own S3 bucket. That has always been my major problem with hosted photo apps - that I couldn't trust them not to disappear with my photos. Whilst Amazon could also theoretically disappear with my photos too, I see them as a pretty secure option.

The only main thing missing here is the ability to install the web application on my own hosting account. I'd love someone to have a business model where the base app is free and open source, but there exist paid mobile and desktop apps and third party extensions. Basically, a WordPress-esque ecosystem, but for photos.