Sonoma Valley Visitor's Bureau is a great site for general information about the area and hotel availability.
http://www.sonomavalley.com/
Wedding Ceremony - Napa First United Methodist Church
http://www.napaumc.org/churchpics2.shtml
Wedding Reception - Gloria Ferrer Winery
http://www.gloriaferrer.com/
Hotels and B&B's
http://www.bungalows313.com/ - separate bungalows located 1/2 block north of Sonoma Plaza
http://www.swisshotelsonoma.com/
http://www.sonomahotel.com/
http://www.cottageinnandspa.com/
http://www.foursisters.com/ - The Inn at Sonoma
http://www.elpuebloinn.com/
http://www.vineyardinnsonoma.com/
http://www.marriott.com/hotels/travel/sfols-the-lodge-at-sonoma-renaissance-resort-and-spa/
Restaurants:
The Girl and the Fig
http://www.thegirlandthefig.com/html-sonoma/index.html
Cafe La Haye - dinner only
Murphy's Irish Pub
Basque Boulangerie Cafe
http://www.sonomashop.com/pages/basque.html