Not sure if I can do this on the forum but I have just received a guide from a company (Not sure if I can post there name here), and to me this is an excellent guide. It covers everything to do with Projectors and Screens, a sort of 'everything you wanted know, but were to afraid to ask!' guide. It is in PDF format, and I can mail it to anybody that would like a copy. It states on the front page : "Permission is granted for this publication to be given away to colleagues, friends, business associates and website visitors, provided that this publication is NOT ammended in any form whatsoever". So it's legal. If this is breaking the rules of the forum, then please delete, but if any one would like a copy then PM me and I can forward it to you. I am in no way connected to this company, just found it searching around looking for information.