Dear Customer,

You can file ITR-2, as the income from rent falls under the head "Income from house or property".

Please refer to this summary table:
http://www.investmentyogi.com/cs/blogs/taxes/archive/2009/06/04/which-form-should-i-file.aspx

Also, your rental income would be taxed under the following tax slab structure for last year ie AY2009-2010:
http://www.investmentyogi.com/cs/blogs/taxes/archive/2009/04/07/income-tax-slab.aspx