Pixelmator has updated their iOS app for iPhone (now at version 2.0.2) which brings some great performance improvements. There is a five times faster Repair tool, enhancements to the retouch tools, and improvements to the overall editing experience. Even though I think the app is very easy to learn and has a great UI, they have added a complete User Guide and a collection of inspiring video tutorials.
Also they have a huge sale on the app right now for just $.99. Can’t beat this, if you don’t have the app yet get it for just a buck now: