I re-read the threads when Darwin Ortiz was the special guest here and he was talking about how he learned the faro. Now I learned mine from Marlo's Revolutionary Card Technique, however, Darwin tips that if you read Harry Lorayne's short description from Close Up Card Magic that the move will be easier to perfect. I have been trying this out for awhile now, and my faro has greatly improved from Harry's writings. Just thought I would re-iterate this tip for anyone having trouble faroing.

The Michael close faro CD is very helpful as well.

Also try Collected Works of Alex Elmsley Vol.2(by Steven Minch), not only does this cover how to do the move but also some mathematical principles to do with it.
For more things about mathematics of the Faro try out Martin Gardeners Mathematical Carnival, allthough this focuses on maths this section might be usefull.
Owen

I too am having trouble getting this done....probably the hardest knack I've seen