The class action settlement website is here: http://www.gordonvapple.rosenthalco.com/index.html
The pdf listing the configuration codes (the last three characters of the serial number) is at: http://www.gordonvapple.rosenthalco.com/pdfs/ACG_EX1_web_080922.pdf
FAQ on the settlement is at http://www.gordonvapple.rosenthalco.com/faq.html
Depending on when you bought the adapter, you can get from $25 to $79.
Edit: Note that the deadline for adapters purchased on before 14 October 2008 is 11 February 2009. If you bought one after that, you must file within 120 days of the adapter failure, or 31 May 2009, whichever is earlier.