Zillow.com, the real-estate Web site, announced yesterday it has raised an additional $30 million which comes on top of the $57 million raised since its launch 18 months ago. Zillow Chief Executive Rich Barton (Expedia founder) said

“Zillow will use the new cash to continue improving its Web site and augment its advertising sales force. The company, which offers estimates of home values called “Zestimates,” has 155 employees, including 20 national ad sales representatives. It also now lets people post homes for sale on the site and ask questions about specific properties.

“The company is trying a localized advertising program. Businesses such as plumbers, architects or real-estate agents use the program to deliver targeted ads to people searching for home information within specific ZIP codes. About 6,000 businesses have participated.