Expat.com is a worldwide directory of blogs related to expatriate life, with listings for India.
Lonely Planet India
Lonely Planet South India and Kerala
Lonely Planet Rajasthan, Delhi & Agra
India (DK Eyewitness Travel Guides)
Fodor's Essential India
The Wonder That Was India
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.