Branching to an online market, Mens Health magazine has plans to teach you how to buy the perfect pair of jeans. And not only that but they explain all the other questions you may have, and some you don't but are interesting nonetheless. Of course you could always just read the article I wrote in May. I'm kidding, go take a good look around. If you prefer the print version they have also gone into detail in their September Issue, which if I may say is the best I've read in a while.
Find your perfect fit!