New Version of D3 Tips and Tricks PDF Added

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).