A Gathering at the River

I've seen on Flickr so many exquisite shots of forests with beams of sunlight coming through the trees. I know some of those were taken on foggy days and the beams were actually there when the shot was taken but I suspect that many of the light beams were created in Photoshop so I set out to learn how to do that. Haven't quite figured it out yet but this is the first one worth sharing even though there is only a hint of visible beams of light. I did this using radial blur. Anyone have suggestions?

Done