Are you searching for official budget website if government of India ?
here it is.
You can get complete details of the Union Budgets, Economic Surveys, Railway budget and State budgets of the previous Years as well as current year i.e 2008 2009 presented by p chidambaram in the parliament.
Here are the website address of past budget presented by finance minister of india.
Union Budget ub2007-08
http://indiabudget.nic.in/ub2007-08/ubmain.htm
Union Budget 2006-2007
http://indiabudget.nic.in/ub2006-07/ubmain.htm
Union Budget 2005-06
http://indiabudget.nic.in/ub2005-06/ubmain.htm
Union Budget 2004-05
http://indiabudget.nic.in/ub2004-05/ubmain.htm
Union Budget 2004-05
http://indiabudget.nic.in/ub2004-05(I)/ubmain.htm (interim)
Union Budget 2003-04
http://indiabudget.nic.in/ub2003-04/ubmain.htm
Union Budget 2002-03
http://indiabudget.nic.in/ub2002-03/welcome.html
Union Budget 2006-2007
http://indiabudget.nic.in/ub2001-02/welcome.html
Union Budget 2000-01
http://indiabudget.nic.in/ub2000-01/welcome.html
