Many investors having a good portfolio are unaware of this wonderful site from the Stock exchanges (both the National Stock Exchange – NSE and Bombay Stock Exchange – BSE). I frequent the nseindia.com
Two Basic features which can be used at the minimum are :
A) Get Quote Feature – Just type in the name of the company and the next link gives so much information about the company like Face Value, 52WH, 52WL, Corporate action information (Bonus, Split, Dividends etc.) , Upcoming Board Meetings , Shareholding Pattern etc.
B) The Sparklines is a new feature  which gives the breakup of the Index constituents : Nifty, Junior Nifty, CNX IT, Bank Nifty , CNX Midcap and ETF along with some good sorting feature. I will cover this in detail in some later post.
Have you visited the site. If not, go and browse it, it contains a wealth of information for investors.