I've added a new version of D3 Tips and Tricks to the links on the right.
I've also added the following to the document;
Make a dashed line
Filling an area under the graph.
CSS for an area fill
Define the area function
Draw the area
Adding a drop shadow to allow text to stand out on graphics.
CSS for white shadowy background
Drawing the white shadowy background.
I've also added the document as D3-Tips-and-Tricks-Latest.pdf in the hope that I should be able to change out the document in the public drop box for a new version and if people follow the link they should get access to the latest version even if the link is old (fingers crossed).