Some useful websites.....!
   
Income Tax
TAN Search
PAN Search
ROC
Service
ICAI
ISA
Central Excise
NSDL
Banks
ICICI Banks
 
Government Sites
   
Finance Ministry
Ministry of Law & Justice
Indian Railway
DOT
India Map
 
Stock Market
   
ICICI direct
Indiabulls
Karvy
5 Paisa
 
Airlines
   
Air India
Jet Airways
 
Search Engines
   
Google
Yahoo
MSN
 
Sales Tax Website of Indian States
   
Andaman and Nicobar Islands
Andhra Pradesh
Arunachal Pradesh
Assam
Bihar
Chandigarh
Chhattisgarh
Dadra and Nagar Haveli
Daman and Diu
Delhi
Goa
Gujarat
Haryana
Himachal Pradesh
Jammu and Kashmir
Jharkhand
Karnataka
Kerala
Lakshadweep
Madhya Pradesh
Maharashtra
Manipur
Meghalaya
Mizoram
Nagaland
Orissa
Pondicherry
Punjab
Rajasthan
Sikkim
Tamil Nadu
Tripura
Uttaranchal
Uttar Pradesh
West Bengal
Disclaimer : These links are provided only for reference purposes.