60,000? 75,000? Unknown, but there were people everywhere - in Dolores Park, on Muni and trying to find parking on every street within "walking distance" (or so it felt when we walked back to Noe Valley). Here's a few pics from the day.
[NVSF: Preview: Red Bull Soapbox Race]
[NVSF: We're So There: Red Bull Soapbox Derby]
[Official Site: Red Bull Soapbox Race]