Ashton Kutcher's last startup, Ooma, flopped big-time. But TechCrunch editor Michael Arrington is still smitten with the Hollywood star, who opened the TechCrunch50 conference today. Marissa Mayer of Google speaks at 11:45 a.m. The competing DemoFall startup-launch event continues in San Diego. If you're more concerned with getting your own startup off the ground than hearing about someone else's, learn about mobile strategies in Berkeley, or recruit a database expert at tonight's MySQL meetup in San Francisco. (Photo by magerleagues)

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