A nice CSS/ DOM based tree menu based on ordinary lists.
An identity and logos gallery.
A nice set of CSS page templates and tutorials, from Intensivstation.
A great open source client side code syntax highlighter to show code on your site neatly.
If nothing else, use this software to run Mac OSX and Safari on your PC.
Overview of the new multi column layout module in CSS3.
A showcase for those sites that display its content in horizontal format.