HDR (High Dynamic Range) photography isn't for everyone, but it can really help when taking pictures with extreme shadow or light. HDR images basically combine two or more pictures taken at different exposures. Using a process called tone mapping, you get a new image that displays more detail in the darker areas and restrains the areas that are too bright.
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.
