Digital Anarchy is fully focused on their Photoshop plug-ins and have some new tutorials on their site which use Knoll Light Factory for Photoshop.
Creating Volumetric Light - We all know the look of a beam of light bursting through the clouds or coming from the top of a dusty (and otherwise dark) cave. Usie Knoll Light Factory in conjunction with some of Photoshop's built-in filters to create this look very easily.
Blurring Elements - On high resolution images, Knoll's light flares sometimes show thin lines that don't look realistic. This tutorial talks about ways to deal with this problem and produce natural looking lens flares. This movie may take a few minutes to load.