I just found a pattern drafting tutorial that looks pretty good:
http://www.ikatbag.com/2010/07/drafting-part-i-overview.html
It looks to be for children, but should be applicable to adults.
Actually, after looking more at this blog, there is a lot of information there. I'm subscribing once I get back to my home computer.
Here's another blog that has pictures for how to measure yourself properly.
http://sewingin-nomansland.blogspot.com/2011/05/measuring-yourself-correctly.html
