[Air-l] Computer self help press

I wonder if there are studies into the computer press explosion? I would really like long term book sales figures or production figures. I have not been able to find much about it or any idea of the size of this exploded production of books. In particular dummies and idiots guides interest me but there are numerous other presses out there. Peter Timusk B.Math Just trying to stay linear www.crystalcomputing.net >blog> http://logbook.crystalcomputing.net www.webpagex.org >blog> http://notebook.webpagex.org