Unfortuantely...ANY available home or sale effects home values. If you are in a community where there are many foreclosures or short sales then your property will be effected. Your home is only worth what someone is willing to pay. Today your home IS worth less than it was in the past. I don't know what your personal circumstance are, but if you are in the situation to also buy something, you will also be paying less for your new purchase...so it is all relative.
Are you working with a REALTOR to market and sell your house for you? If you need a great agent, let me know....you are just North of me and I will refer you to someone who is one of the best in your area. This is a free service I am offering you...so let me know if I can help...
Good Luck ,