Useful Links
INDIA

DGCA

http://www.dgca.gov.in/

WPC, Department of telecommunication India 

http://www.wpc.dot.gov.in/
USA
Federal Aviation Administration
http://www.faa.gov/

TSA

http://www.tsa.gov/
US Immigration and Custom Enforcement
https://www.fmjfee.com/i901fee/

USA Consulate (VISA)

https://www.vfs-usa.co.in/USIndia/Index.html
Aviation Weather
http://aviationweather.gov/

ICAO

http://icao.int/
UK
http://www.caa.co.uk/
UK Consulate (VISA)
http://www.vfs-uk-in.com/
New Zealand
Civil Aviation Authority New Zealand
http://www.caa.govt.nz/
Other Useful Links  
Aviation Job Search
http://www.pilotcareercentre.com/
DGCA forms (Sample copies)
http://www.scribd.com/altivia_aviation