Pioneering adventure game designer Ron Gilbert will deliver the keynote address at this year’s Penny Arcade Expo in Seattle, event organizers have announced. The designer follows in the footsteps of BioShock creative director Ken Levine, who keynoted the popular convention last year. Penny Arcade Expo 2009 is being held September 4 to 6 at the Washington State Convention and Trade Center. It is the fifth annual consumer gaming show held by Jerry Holkins and Mike …