SAN FRANCISCO and BOSTON, September 21, 2000 - domania.com, the online real estate infomediary and a CMGI @Ventures portfolio company, and MarketWatch.com, Inc. (Nasdaq: MKTW), the publisher of the most visited financial news site on the Internet, today said that domania.com will power the Home Sales Tool found within the CBS MarketWatch.com Web site ( http://cbs.marketwatch.com).

The tool, which gives MarketWatch.com visitors free access to over 21 million actual home sales records, is the latest addition to CBS MarketWatch.com's varied portfolio of personal finance data and tools. The Home Price Check search engine (http://homepricecheck.marketwatch.com) allows visitors to search for actual home sales price records by street, by specific property or by price range in cities and towns across the United States, enabling users to be better informed when they purchase what is usually their single largest asset - their homes.

MarketWatch.com will promote the Home Price Check tool from various locations within the site, such as the home page, the Market Data and Tools page, the Personal Finance page and its Real Estate section.

"Working with CBS MarketWatch.com, an online leader in personal finance and business news, we're moving management of the home as a financial asset to the next level," said Steven Kropper, chief executive officer, domania.com. "Availability of the domania.com search engine on the CBS MarketWatch.com web site not only will provide a vital service, it also will raise awareness of our domania.com brand among the millions of consumers who rely each day on MarketWatch.com."

"The home sales search engine will provide MarketWatch.com with a new and extremely powerful personal finance tool that will enable users to make the best possible home-buying decisions," said William Bishop, MarketWatch.com Executive Vice President, Business Development. "We are extremely pleased to join with domania.com in making Home Price Check available to the users of the CBS MarketWatch.com web site."

About Domania.com

Domania.com, Inc. powers real estate research on the Internet, giving consumers information to help them save time and money in the real estate process and to support lifetime management of their largest assets - their homes. The company operates a leading real estate Web site (http://www.domania.com) and distributes a popular comparable home sales search engine across the Web through leading properties including MarketWatch.com, Inc., Yahoo! Real Estate, America Online, Motley Fool and Dow Jones. domania.com creates strong and informed relationships among consumers and the home services and real estate professionals who serve them. Closely-held domania.com is an investment of CMGI @Ventures, the venture capital affiliate of CMGI.

About MarketWatch.com, Inc.

MarketWatch.com, a leading interactive financial media company, provides fast, relevant information via the Internet, television and radio to help people make and save money. The company operates leading financial Internet websites at http://cbs.marketwatch.com , http://www.bigcharts.com, and, in a joint venture with the Financial Times of London, launched its first international site at http://www.ftmarketwatch.com. MarketWatch.com's financial news and tools are licensed in custom-designed formats by major brokerages and Internet sites.

In addition to producing CBS MarketWatch Weekend, the company also provides radio network news programming via The MarketWatch.com Radio Network, which offers business reports twice an hour, 24-hours a day, 5 days a week, plus weekend features and special extended coverage of major business news stories. Founded in 1997 and headquartered in San Francisco, MarketWatch.com has facilities and bureaus in New York City, Minneapolis, Washington D.C., Los Angeles, Chicago, Boston, Detroit, Atlanta, Dallas, Austin, Tokyo, Hong Kong and London.

CBS MarketWatch.com is the most popular Internet destination for business and financial news according to the latest data from the research firm Media Metrix.