Tasty-Takes: A Beerman's Guide to Everything Fishing has a couple of tutorials up on how to open a bottle of beer sans opener.
Seriously guys? What self respecting beer drinker has not resorted to caveman instincts and used any tool at hand to crack some bottled suds? If you need lessons on how to open bottled beer without an opener I suggest switching to twist offs..... or cans.....or a piece of paper.