Assuming all income from wages, you file a joint tax return, use standard deduction, do not have any dependents, do not have other deduction and credits - your estimated income tax liability for 2009 would be $11,450.
You might be eligible for Making work pay credit - $800
If your tax liability is less than your withholding - you would be able to claim a refund.
If you itemize deduction - your tax liability might be less.
Let me know if you need any help.