Typography on the web has become a point of focus for standards based developers recently. The pioneering work by Mark Boulton and Richard Rutter has highlighted the importance of good web typography. With the advent of more standards compliant browsers and a better understanding of the capabilities of CSS, more developers are spending the extra time and effort in pursuit of typography excellence within their designs.
I posted to delicious.com
James Whittaker - Em based layouts - Vertical rhythm calculator
http://www.jameswhittaker.com/blog/article/em-based-layouts-vertical-rhythm-calculator/x