Media Monitoring
www.ecola.com (great resource for finding newspapers and other media)
www.cision.com (great tool for media monitoring)
www.factiva.com (another great tool for media monitoring; robust and expensive but very effective for large companies)

Information and Research
www.prsa.org (public relations industry's professional organization)
www.surveymonkey.com (cheap, quick way to get anecdotal research done—great tool on the fly)
www.prandmarketing.com
www.odwyerpr.com (insider information about the PR profession)

Politics
www.pollingreport.com (clearinghouse for national polls; political candidates and issues)
www.realclearpolitics.com
www.politico.com

News
www.ap.org (Associated Press)
www.daybook.com (see AP stories filed by various bureaus; post your own news release and events)