There are lots and lots of photography apps and accessories available for the iPhone. Every once in a while one comes a long that really sets the bar and that's exactly what VSCO Cam for iPhone does. Not only does it have lots of features including filters and adjustments, it allows you to share photos with many different social sharing service in a single tap. More importantly, it's extremely easy to use.
Albumatic for iPhone is somewhat similar to photo sharing services like Instagram but focuses more on creating albums and sharing them with the people you already know, not just anyone. It's somewhat simliar to Apple's own Photo Stream service but allows your friends to add to your albums, not just view them. Albumatic may be a great alternative for those who want to collaborate on albums instead of just sharing and viewing.