I ate at the Fig Cafe and Wine Bar (Glen Ellen outpost of the Girl and the Fig) and had a great meal. It's a funny place because they court the locals with a zero-corkage policy, and have great hamburgers. It seemed like 2/3 of the people were locals with vacation houses taking their guests, and 1/3 were flat-out tourists like us. I saw a huge number of hamburgers out at every table. We had an excellent mussel dish, cheese plate with some housemade sausage, their signature salad, and a super good pasta dish that was clearly fresh-made. I didn't notice anyone else ordering as much from the breadth of the menu, although I couldn't see every last table.
I had the sense that we simply lucked on in ordering.
The place was a little loud. Kids were welcomed (several 5 to 8 year olds, several strollers). But the food was flat-out great.
Since I don't dine in that area much I can't compare to the other more usual recs, but we thought Fig Cafe a great little gem --- and straight-up glen ellen, no reason to go to Sonoma. Casual but excellent, we ate there after a friday drive from the bay area when we didn't want to go all the way to sonoma. We were also shocked at the low price - girlfriend was somewhat agape - we were out the door for $70 with tip, I think - we normally pay quite a bit more for the same quality.
Yes, I know the original thread was Napa but not Sonoma, but I didn't think my note warranted a whole new thread - and I'm tired of searching for a more appropriate thread.