The best way is to contact a good Realtor in the area. A Realtor can provide an extensive market analysis, and give you an idea of what is happening in the market within the county. There may be conditions which affect your property that you may not know, and there may also be things about the particular area that may increase or decrease the value of the property in question.
There have been changes in the mortgage market recently that have made a huge impact on the markets everywhere. But all real estate is local, and the markets have been affected in this in different ways. New York has weathered the crisis better than some other places like Florida, Las Vegas and Arizona.
If you are considering selling your property, a good Realtor can help you get an idea of the market times of property that has sold, and can advise as to how to best showcase and spotlight your property in order to position it properly. It's always best to have an expert on your team, and with the market today, it's also wise to have someone who can advise you how to sell your property with the least time on the market.