What is your home's value? Here is a link to a tool that displays values...but BEWARE - these sites (like zillow and cyberhomes) can't take things into consideration that a REALTOR can. These computerized models can't take into account neighborhood features, foreclosures and distressed sales, upgrades, specific features of the home and local market conditions. These items need human input.
So while being entertained by these values - be sure to contact a REALTOR to get a feel for how these numbers compare to local market sentiment.