Some Important Academic Institutions of India:
Indian Institute of Science, Bangalore: http://www.iisc.ernet.in/
Indian Institute of Technology Kharagpur: http://www.iitkgp.ernet.in
Indian Institute of Technology Bombay, Mumbai: http://www.iitb.ac.in
Indian Institute of Technology Madras, Chennai: http://www.iitm.ac.in
Indian Institute of Technology Kanpur: http://www.iitk.ac.in
Indian Institute of Technology Delhi: http://www.iitd.ac.in/
Indian Institute of Technology Roorkee: http://www.iitr.ernet.in
Indian Statistical Institute, Kolkata (Calcutta): http://www.isical.ernet.in
Some Scientific organizations of India:
National Board for Higher Mathematics: http://www.nbhm.dae.gov.in
Department of Science and Technology, Govt of India: http://dst.gov.in
University Grants Commission: http://www.ugc.ac.in
Indian Academy of Sciences: http://www.ias.ac.in
Travel:
Indian Railways: http://www.indianrail.gov.in/
Indian Airlines: http://indian-airlines.nic.in/
Air Sahara: http://www.airsahara.net/prod/
Jet Airways: http://www.jetairways.com
Air India: http://www.airindia.com
Aeroflot Russian Airlines: http://www.aeroflot.com/
Air France: http://www.airfrance.com
LOT Polish Airlines: http://www.lot.com/english/
Air Kazakhstan: http://en.airkaz.com/main.html
Currency Converter:
XE Universal Currency Converter: http://www.xe.com/ucc/
Oanda Currency Converter: http://www.oanda.com/
Sports:
Cricket: http://www-ind.cricket.org, http://www.khel.com
Basketball: http://www.nba.com
Ice Hockey: http://www.nhl.com
I will try to add more links.