Wikipedia - Tamil Nadu - Guide to the state. Includes information on geography, language, history, and economy. Links to district and more specific data. - http://en.wikipedia.org/wiki/Tamil_Nadu
Indiaclickinfo - Link page and website for a series of directories and guides providing information about the country. - http://www.indiaclickinfo.com/
Tnoli - Business portal for Chennai and Trichy. Information about businesses, hotels, and travel. - http://tnoli.com/
Vanavil - Portal site for Tamils covering shopping, film reviews and songs and articles. - http://www.vanavil.com
Tamil Search - Web search for any Tamil site. - http://www.tamilsearch.net/
Southindia - Provides information about South India's travel packages, information to tourists, and students. - http://www.southindia.com
Tamil Nadu Cities Guide - Comprehensive guide to towns and cities in Tamil Nadu - http://www.searchindia.com/search/Regional/States/Tamil_Nadu/Cities/index.shtml
TamilAnnam - Web guide to Tamil and Tamilnadu related resources. - http://www.tamilannam.8m.com