Web Typography
Jon Hicks has a quick introduction to various typography terms. Have you ever found yourself wondering what line-width, em and serif were? Or what font is appropriate for headings and content? Then, this presentation is for you. His presentation also has a list of related links.
I was surprised to find out that Lucida Grande is the default font on Max OSX. The default font in Keynote is Gill Sans, so I assumed it was same throughout. Gill Sans is one of my favorite fonts.