Compression

http://dyn.com/open-dialogue/dynamic-discourse/dns/educational/how-we-got-dyndns-com-to-load-faster-and-how-you-can-learn-from-it the subj. how to optimize webpage load speed by compressing, optimizing images, js, css

http://habrahabr.ru/blogs/php/73637/#habracut article in Russian that explains RAR archive format, and shows example php code that gets list of files out of the archive