Computer Darkroom's Lens Blur Tutorial
The Computer Darkroom website have recently published a guide to using the Lens Blur feature in Photoshop CS:
“One of the most useful features introduced with Photoshop CS is the Lens Blur filter. Unfortunately Adobe failed to provide much in the way of guidance as to how it is to be used. This short tutorial shows one example whereby I have used the filter to replicate a widely used photographic technique called differential focus.