West Bengal Government Official Home Page : Good site with various information on West Bengal.
Bangla Live : A full-fledged website in Bangla with Bangla Chat, Bangla email, daily news, etc.
Calcutta Web : A complete Guide to Kolkata, Bengal and Bengali. This site is full of links. Has organized sections to point you to the information you need quickly; like sports news update, Exchange rates, etc. Also has Bangla calendar
Kolkata Telephones (BSNL) : Website of BSNL (Bharat Sanchar Nigam Limited- Kolkata)
Bengal Online : An extremely well-designed, easily navigable and aesthetically appealing community site on Bengal, one must visit this site.
Bengali Net : This well-designed site has Bengali calendar, a site for Durga Puja including calendar, E-cards, Shopping, Astrology, Google Search, free email, Bengali food and a good links section
Abasar - an information website in Bengali. Content: Information on law, health, science, environment and women's issues. Directory of local and community services of Dhaka and Kolkata. Recreational items.
Parabaas-- Nice Bengali e-magazine promoting literature and culture.
Bengali New Year e-Cards at 123greetings- -Bengali New Year e-cards.
Samachar : A good site, gives link to all Newspapers of India including Bangla (go to Regional - East - Bengali) and English Newspapers published from Kolkata. This is one of my daily viewing site
India Times : A Times of India Group Collection. It has got normal features including email, shopping, sending gifts within India. But it has got all the links to Times group newspapers and Publications (Go to News/Media/Finance section). You can see Economic Times, Times of India. For Ladies Go to IndiaTimes Women section, also read Femina
Ananda Bazaar Patrika : A must daily read site for Bengalis allover the Globe
Official India Tourism site : Incredible India. Foreign Tourist in India is growing at a rapid rate. Don't miss the chance of knowing various attractions in India, before you actually visit India. Indians living in India also will find this site informative and helpful
India Tourism : Good site, has travel plans from Kolkata
NASSCOM : Website for National Association of Software and Service Companies. Very useful for IT Professionals.
Official Govt. of India website : Hosted by NIC. Can take you to president of India, Prime Minister of India, also to other ministries.
Google India Home Page : Search in Bangla
Thatscricket : A site for information on Cricket
Khel.com : All type of India games. A very good site promoted by Sify
rediff.com sports page : A good sports coverage including Football, Hockey, Chess
IIT, Kharagpur official website : Website of IIT Kharagpur.
IIEST, Shibpur official website : Website of IIEST, Shibpur (formerly Bengal Engineering and Science University, Shibpur).
Jadavpur University official website : Website of Jadavpur University.
University of Calcutta (Kolkata) : Our own university
ISI, Kolkata : Official website of Indian Statistical Institute, Kolkata
Bengal Engineering and Science University, Shibpur (Alumni Association) : B.E. College Shibpur alumni website.
IIT Kharagpur Alumni : IIT KGP allumni website
JBIMS, Mumbai : Official Site of Jamnalal Bajaj Institute of Management Studies, a premier Management Institute at Industrial Capital of India, Mumbai
Bombay (Mumbai) university : Bombay University website.
Delhi university : Delhi university website.
India Food Guide : A good guide for Bengalis living abroad
Sanjeev Kapoor : Khana Khazana famous Sanjeev Kapoor's website
Please also check this link for more local information.