How to reach market research agencies with online ads

I am wondering if you have any ideas on which websites would be worth advertising a free service for market research agencies. What are the most popular websites visited by market research professionals?

The European Commission has cleared the proposed acquisition of the online advertising technology company DoubleClick by Google. The Commission's in-depth investigation, opened in November 2007, concluded that the transaction would be unlikely to have harmful effects on consumers, either in ad serving or in intermediation in online advertising

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drip marketing
CD Printing

Market research World(MRW) previously Market research Portals offers a host of online resources and research related articles relevant to market research buyers, researchers, newcomers to the industry, students and individuals with an interest in the market research industry. The site has been developed and managed by a UK market research agency. However, the website is owned and operated by Research Portala Ltd. The site is run on a not for profit basis, investing earned revenue to improve this resource for all users.