We certainly think serious play is important, but these experts articulate the case much better than we ever could. Thanks to TED Talks, there is a growing collection of thinkers who have very interesting and engaging talks about the value of play for people of all ages. Here they are in their own words.
The Play4Agile Unconference will be held February 18th-21st, 2011 in Germany. Admission is free, provided you offer a position paper. They have a wiki with more detailed information, as well as some planning activities. You can learn more here: http://p4a11.pbworks.com/w/page/29184741/Home