Just got the heads up from Mariko, a local blogger:
"We got the frozen custard at a frozen yogurt place in Mill Valley. It's right off the main Mill Valley exit in Strawberry Village (you can see it from the freeway--it's on the east side). It's called Woody's, I believe. They only have vanilla in the frozen custard, but it was tasty and very creamy and nearly killed me (lactose intolerance). The pumpkin frozen yogurt was also very good."
Anyone tried it yet? If u do please report back.
From a google search:
Woody's Yogurt Place
214 Strawberry Village, Mill Valley, CA