iPhone: You won't find a shortage of how-to guides and websites on the internet, but if you're looking for a dead easy way to create and explore them on your iPhone, Snapguide is a new app that is about as simple as it gets.
Snapguide allows you to browse and search through its repository of user-created guides pretty easily, but the handiest feature is the ability to create video or photo guides directly from your phone. The goal is to create a more realtime environment for how-to guides where you can start doing something and document the process easily as you go along. In turn, anyone looking to find out how to do something will find the tasks laid out pretty clearly.
It's a little like a portable, dead-simple version of Instructables that's easy to keep in your pocket. If you have some skills you want to show off or you just want to learn a few new things, Snapguide is worth checking out. It's a free download in the iTunes App Store.