http://en.wikipedia.org/w/index.php?title=Special:Book&bookcmd=book_creator&referer=Main+Page
Expectedly indeed! There goes openness!
Sometimes, you just need to play with the margins, remove some irrelevant pictures, remove some sections, or increase the font and save some paper and toner cartridge while you are at it
I don't know if you involve in this, but since those are creative commons texts anyway, how soon do you expect for someone to code an online interface to offer that service?
lbrtchx