October 13, 2009 — Matt Mullenweg gives an overview of the GPL and how it benefits WordPress, why WordPress is licensed under the GPL, how the GPL fosters innovation, affects themes and plugins, and creates value.
The directory of premium theme authors who support the GPL as mentioned in the interview is located here.
September 19, 2009 — Matt Mullenweg of Automattic answers questions from the WordPress community, including making money from open source products, migrating from WordPress.com to WordPress.org, the history of WordPress, the roles system in WordPress, core vs. plugins, blog comments, WordPress security, and more.
Video production by Joe Christensen of Blaze Streaming Media.
July 11, 2009 — A question and answer session from WordCamp Montreal with Matt Mullenweg. Questions were submitted by WordCamp attendees and also asked during the session, and cover such topics as tags on WordPress.com, the WordPress upgrade system, multilingual support in WordPress, and more.
July 3, 2009 — Matt Mullenweg’s presentation on web app performance at the Velocity 09 conference
June 28, 2009 — John Pozadzides moderates this panel discussion—along with attendee-submitted questions—with speakers Matt Mullenweg, Giovanni Gallucci, Liz Strauss, Andy Skelton, Dave Moyer, Mark Hopkins, and Cali Lewis. Video provided by Dave Curlee.
June 21, 2009 — Matt Mullenweg delivers his State of the Word presentation at WordCamp San Francisco 2009
April 30, 2009 — Matt Mullenweg’s State of the Word presentation at WordCamp Tokyo 2009 – in English with Japanese subtitles, マット・マレンウェッグ氏基調講演 ワードキャンプ東京2009 （英語音声／日本語字幕）
Video by Atsushi Ogisawa 荻澤 篤志
Subtitle by Mizuno, Nao, Toru
April 5, 2009 — Matt Mullenweg delivers the State of the Word to WordCamp Hong Kong.
February 28, 2009 — Matt Mullenweg delivers the State of the Word to WordCamp Denver.