These 2 Column Faux CSS Layouts use a background image to make it look like the left and right columns are equal in height and independent of each other.
Things couldn't be further from the truth. I created a parent column called faux and vertically tiled the image, that contained both the left and right child columns. I then vertically tiled the faux background image and viola.
I first found about this method from the alistapart site by a guy called Dan Cederholm