HomeRun and TrakerJphx,
There are several Syndicate Sites that will accept your feeds "Free of Charge", including Google Base, Trulia, Zillow, and FrontDoor (HGTV's site). The trick is getting the feed into the correct format (one size does not fit all) and meeting each one's submission requirements. If you have a small number of listings(around 20 or less) there are sites that will allow you to hand enter the information, saving you the the headaches trying to create the feeds yourself. For a large number of listings, I recommend the program found on our site: [url=http://www.artis-usa.com/Products/RES/RESCorp.asp]http://www.artis-usa.com/Products/RES/RESCorp.asp[/url] .
Best of Luck,
Graham