If you have purchased a home in 2009 and have not yet filed your taxes, we encourage you to consult a tax professional. There are tax advantages that you may not be aware of if you have not owned before. In addition to the interest you pay each month, there are most likely additional deductible items on the HUD1 form that you received at settlement.
Also, if you do decide to do your own taxes, make sure that if you are eligible for the home buyer tax credit that you get the right forms from the IRS. Here is one of the links to do that: IRS tax credit forms.
The experience of our buyer clients is that it pays to hire a tax pro... at least the first time you purchase a home since they will often save you far more than they cost. All good ones should be up front and open about their fees, so that you can make an informed decision.