However, I have FOUR pair of custom orthotics-- and only one pair actually helps--so you just have to get lucky with the custom orthotics it seems.
Also, the night splints have really helped me a lot. I bought mine from Biodex (1-800-224-6339) for about $50 each. I notice a difference when I don't wear them.
I'm not cured, but between my custom orthotics, night splints, and stretching my right foot barely bothers me. I still have problems with my left foot.