This is a good tutorial as it covers the basics.
Nevertheless, readers should know that CSS can be taken to the extreme and should know the other side of the story in regards to fully integrated CSS.
One of the points to always remember in any technology is the K.I.S.S. principle.
Tables versus fully CSS (i.e. replacing all table tags with div tags)
http://www.decloak.com/Products/Dreamweaver/NestedTemplates/TablesOrLayers.aspx