Here you find lots of good sources for planning your journey to San Francisco:
For official tourist information
From the City and Country
The San Francisco Blog for Girls
The SF Blog for people on a tight budget
Unique Stories and Events in SF
Eating your way through SF
Train – Save me San Francisco
Pep Love – Pacific Heights
RBL Posse – Don’t Give Me No Bammer Weed
Eric Burdon & The Animals – San Franciscan Nights
Ashkon – Don’t Stop Believin’ (Giants 2012 Anthem)
If you rather prefer videos to get prepared for your trip, I recommend watching these:
But be warned - you will fall in love instantly!
Flying over San Francisco with Dubstep!
What can I say? I just love the city: