TrueHDR for the iPhone has been updated to support the full resolution of the iPhone cameras, both front and back. It now supports the Retina Display, and claims better image alignment and more natural looking results.
I've reviewed the original version and today I gave the new version a try. The updated app works as advertised, although I was a little short of dramatic scenery for my tests. The added resolution and quality of the iPhone 4 camera makes a welcome difference.