Graeme, I don't know about finding such info on the web, but master printer Howard Bond does regularly contribute to the pages of PhotoTechniques and has done a number of articles on his unsharp masking techniques. I've attended his masking workshop and can tell you it's pretty impressive stuff. There have been other articles in there as well including ones by Alan Ross on his particular technique. PhotoTechniques has a web site and offers reprints of some of their more popular articles as well as back issues as available. Good luck down there, Bob