How do I determine how much my home as devalued due to the financial/foreclosure crisis?

I have no idea what the present value of my home is. Do I need to pay to get an appraisel to determine this for me?How do I determine how much my home as devalued due to the financial/foreclosure crisis?Save some money %26amp; survey via papers %26amp; neighbors your local market local agents could help if approach properly.How do I determine how much my home as devalued due to the financial/foreclosure crisis?An experienced appraiser will give you the best estimate, otherwise you could try Zillow.comHow do I determine how much my home as devalued due to the financial/foreclosure crisis?To really know how much value has been lost, sell the house just before the crisis, then sell it again now. The difference is how much it has devalued.