ProfNet is a collaborative of public relations professionals linked by the Internet to provide journalists and authors convenient access to expert sources. Represents organizations of every type in North America and Europe — colleges, universities, corporations, think tanks, laboratories, medical centers, non-profit organizations, government agencies, and PR agencies. Offerings include:
ProfNet Search — a “broad search” option that delivers about 600 media queries weekly to the screens of 11,000 members in North America and 1,000 members in Europe;
ProfNet’s Experts Database — a “narrow search” option offering ready-made leads on 4,200 expert sources;
ProfNet Leads — a weekly tipsheet sent by email to reporters in healthcare, technology and business;
Media Insider — a Web-zine reporting on the production of news from the perspective of news and information officers.
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a note on the site mentions that soon it may be restricted to registered press personnel only so use it while you can. Though I would recommend if you find the site of interest email them and request access for registered students as well.