Name of the websites from where I can find out details about Income Taxes in US?

Answer 1

The BEST resource about income taxes in the US is the Internal Revenue Service IRS http://www.irs.gov

Then you can go to other sites such as

History of US Income Tax (Library of Congress) http://www.loc.gov/rr/business/hottopic/irs_history.html
Fact Sheets - History of US Taxes (US Dept of Treasury) http://www.ustreas.gov/education/fact-sheets/taxes/ustax.shtml

Then you can go to tax preparer websites which always have loads of information on taxes

http://www.hrblock.com/
http://www.jacksonhewitt.com/

Answer 2

www.irs.gov