What do 15,000 Java developers have in common? Besides a love of object-oriented programming languages and an oddly-shaped mascot named Duke, Java developers act en masse. How do we know? Sentilla was commissioned by Sun Microsystems to instrument the Moscone Center in San Francisco with over 200 pervasive computers during the 2008 JavaOne conference. Sun wanted to have greater insight into the behavior of attendees during the conference so that organizers could adjust energy-usage in real-time and better plan for future events. Each morning, John Gage presented Sentilla's findings.