Expat.com is a worldwide directory of blogs related to expatriate life, with listings for India.
Lonely Planet India
Lonely Planet South India
Lonely Planet World Food India
India (Eyewitness Travel Guides)
The Rough Guide to India
The Rough Guide to South India
National Geographic Traveler: India
Culture Smart! India: A Quick Guide to Customs & Etiquette
India: An Illustrated History
The Wonder That Was India by A.L. Basham
Planet provides a lot of useful travel information, with a section on Asia, including India.
Guides offers a lot of useful travel advice and information for most countries, with a section on Asia, including India.