For everyone who loves to read and make his own conclusions, i can offer the following books for a free download. Enjoy those!
- Saint Petersburg Sights – MobileReference
- Saint Petersburg, Russia. Travel Guide, Phrasebook, & Maps (Mobi Travel) – MobileReference
- St Petersburg City Guide – Lonely Planet
- DK Eyewitness Top 10 Travel Guide: St Petersburg – DK Publishing
- St Petersburg – Solomon Volkov
- St. Petersburg by Andrei Biely
Cities in Motion St Petersburg (available only for USA sitizens, sorry)