Content
A simple two-column layout, that adjusts to font-size changes for useability.
The coloured left column and its right border are actually an image, so the colour and border will continue all the way to the bottom of the page, regardless of which column is longest.
And finally, an expandable left coloured menu. Mostly CSS, but as usual, with a little help for IE.
And, for fun, an extra background image in the main content area.