Exhibit 99.1

                                                         Contact:
                                                         Susan Hickey
                                                         NetRatings, Inc.
                                                         212-703-5909
                                                         shickey@netratings.com




                 NETRATINGS FILES PATENT INFRINGEMENT LAWSUITS
                        AGAINST COREMETRICS AND OMNITURE

     New York, May 19, 2005 - NetRatings, Inc. (NASDAQ: NTRT), a global leader
in Internet media and market research, today announced that it has filed patent
infringement lawsuits against Coremetrics, Inc. and Omniture, Inc. The
complaints, filed today in the United States District Court for the District of
Delaware, allege that both Coremetrics and Omniture infringe four patents owned
or controlled by NetRatings. The NetRatings patent portfolio, which relates
generally to the collection, analysis and reporting of information concerning
computer usage activity, includes United States Patents No. 5,675,510;
5,796,952; 6,108,637; 6,115,680; 6,138,115; 6,643,696 and 6,763,386. Four of
these patents were asserted in the lawsuits against Coremetrics and Omniture.

     "NetRatings has a strong heritage of both developing and acquiring
innovative technologies to support our leading Internet media and market
research products, and we have invested a significant amount of time and capital
in building a comprehensive patent portfolio," said William Pulver, president
and CEO, NetRatings. "With the global Web analytics market forecasted to reach
more than $375 million in 2005 (Forrester Research, March 2005), NetRatings is
uniquely positioned to leverage our investments across this growing opportunity.
Clients in this dynamic sector demand innovation, and NetRatings is committed to
continued development to address market needs. At the same time, as part of an
overall patent enforcement program, we'll continue to monitor the marketplace to
ensure that we are protecting our valuable intellectual property."

                                    - more -



     Mr. Pulver continued, "We are pleased to have engaged the law firm of Brown
Raysman Millstein Felder & Steiner LLP, a leader in the area of technology and
intellectual property law. They share our confidence in our patent portfolio and
have agreed to lead this litigation and the overall patent enforcement program,
and we are delighted to be partnering with them in this effort."

About NetRatings
NetRatings, Inc. (Nasdaq: NTRT) delivers leading Internet media and market
research solutions, marketed globally under the Nielsen//NetRatings brand. With
high quality, technology-driven products and services, Nielsen//NetRatings
enables clients to make informed business decisions regarding their online
strategies. The Nielsen//NetRatings product portfolio includes panel-based and
site-centric Internet audience measurement services, online advertising
intelligence, user lifestyle, demographic and product brand preferences data,
Internet reach and frequency planning tools, and custom data, research and
analysis. For more information, visit www.nielsen-netratings.com

Safe Harbor Statement
This press release contains statements that may constitute forward-looking
statements pursuant to the safe harbor provisions of the Private Litigation
Reform Act of 1995. These forward-looking statements are based on current
expectations and assumptions and involve a number of uncertainties and risks
that could cause actual results to differ materially from those currently
expressed in any such forward-looking statements. Information about potential
factors that may affect NetRatings' business and financial results is included
in its annual report on Form 10-K for the fiscal year ended Dec. 31, 2004 and
its quarterly reports on Form 10-Q, including, without limitation, under the
captions "Management's Discussion and Analysis of Financial Condition and
Results of Operations" and "Risk Factors That May Affect Our Performance." Each
of these documents is on file with the SEC and is available free of charge.
Readers of this press release are referred to such filings. The forward-looking
statements herein speak only as of the date of this press release. NetRatings
does not undertake to update any forward-looking statement that may be made from
time to time by it or on behalf of NetRatings.

                                      ###