Lego has created its new website for Lego Serious Play at http://www.lego.com/en-us/seriousplay/. Today they also pulled the plug from the old SeriousPlay.com website. When you type in its address to the URL then it simply redirects you to the new Serious Play section on the Lego homepage.
If you feel nostalgic then not to worry. A great resource called Internet Archive – Way Back Machine helps you to go to history and has kept the image of the website as of 20 October 2014 in their wonderful database.