Link - An introduction to biodynamics courtesy of wineanorak.com. There's also an interview with James Milton on the site about on the growing field of biodynamic wine producers.
In the United States and in European countries, government doesn't oversee the use of the term biodynamic, but it does allow wines to be labeled as such. Look for bottles that have a mark from the certification bodies Demeter-International or Biodyvin, or have BIODYNAMIC on the label. If you can't find them at local wine store, Organic Style reccomends winezap.com for a list of stores that will ship them to you (depending on your state laws).