The Chronicle has a large number of informative web pages,
25 SF Neighborhoods: tons of information: descriptions, maps, history, culture, sights, shopping, restaurants:
www.sfgate.com/traveler/guide/sf/neighborhoods/
Bay Area Transportation: parking, driving, traffic conditions, airport info, public transport: www.sfgate.com/traveler/guide/transportation/
SF Food & Dining: restaurant reviews, etc: www.sfgate.com/food/
Bay Area Weather: www.sfgate.com/weather/