I worked with Mike Rundle for a few years on 9rules and a few client projects. One of the best designers I ever worked with as he bridged the gap between design and engineering really, really well.
Today he released Filters, an app for iPhone that boasts 800+ photo filters for $0.99. The app is really well done and I really like it. Here is the first photo I edited with it.
Here is the same photo on Twitter, on Instagram, and on Flickr.