These links shows websites about petrified wood that might be interesting for you.
Private Palaeobotanical Laboratory of Fossil Wood
Very interesting web site about fossil plants, by one of the worlds experts on petrified wood.
Website about the most famous petrified wood forest in the world.
Website about the most famous petrified wood forest in Europe.
The petrified wood museum
Informative website, with many photo's of fossils and petrified wood
Wikipedia article about Petrified Wood