Focus on Napa - this web site has features like great steakhouses in wine country, adventures, and cooking classes or camps; it also has upcoming events, virtual tours, and maps, WineCountry.com

Napa Valley Wine Train - official site for the famous train with lunch or dinner rides and, of course, wine tasting, winetrain.com (see review)

Wineries & Wine - alphabetical lists, lodgings, maps, tours, golf, hot-air balloon rides and events, Winezone.com

Winery Tour Reviews - the best 8 tours, reviewed by SFTravel.com

The Wine Guide - see reviews of featured wineries, and a complete lists of area wineries, travelenvoy.com

Historic Inns of Napa - for "romance, unique environment and personalized service," come to this web site to find many of Napa's historic B&B inns, historicinns.com

"Tales and Tastes from a Season in Napa Wine Country" - Frommer's staff writers visit, review, and advise on how to get the most from the Napa wine tasting experience in this podcast, frommers.com

Napa Valley Links - primarily reviews and rates B&Bs, but also lists and describes wineries, dining options, spas, attractions, and much more, napalinks.com

Napa Valley - gorgeous wine country photos by Nicholas Elias; site also has an interactive map and other wine country links, NapaValley.com

Napa Valley Adventure Tours - this company, located centrally at the Oxbow Public Market on First St., offers a variety of great ways to really get out and see the wine country (i.e. not from behind the tinted glass of a limo), learn about it, enjoy what it has to offer, and leave behind  less of a carbon footprint; they rent bikes and kayaks, lead a ropes course, and they offer expert tours (see review)