[ryan_s]

While I love the simplicity of iOS, the second you need to do anything remotely complicated your stuck.

If I want to send said Keynote document, Keynote must know about my email program, conversely if I receive a Keynote file my email program must know about Keynote. I have little faith that my daily file handling can be completely abstracted.

[ttunguz]

Android does a good job of this with intents. Google is also bringing this standard to the browser. It's an elegant way to solve this problem

http://tomasztunguz.com/2011/08/30/liberating-user-data-with...