Post processing of the native iPhone 4s camera images included merging in True HDR, then using PerfectPhoto to crop and sharpen a the image a bit. Photo fx Ultra processing (taking advantage of the Add Layer feature to stack filters) was used to add Photographic/Light Balancing, Diffusion/Warm Center Spot (no blur) and Lens/Vignette/Black Square with default settings reduced to give just a bit of vignette around the edges. A+ Signature was used to sign the image. NOTE that A+ Signature has recently had a significant upgrade so my tutorial might need to be updated also.
For completely different look to this same scene, visit my other photography blog post.