(Updated September 2013)
43 Things – Achieve your goals. The world’s largest goal-setting community. Share your goals and get ideas by viewing other peoples goals.
Alexa Top 500 – Alexa Top 500 Global Sites.
Amazon Best Sellers – Best selling books on Amazon – updated hourly.
AOL Hot Searches – Find the most popular searches as compiled by AOL Search
Barnes & Noble Bestsellers – The top 100 books of the hour.
BlogCatalog – Blogging portal.
Dictionary, Thesauraus and Encyclopedia – Find the meaning of words as well as synonyms and antonyms.
Google Blog Search – Search for blogs in your niche.
Google Groups – Find out what people are doing with Google Groups.
Lecture Fox – Free university lectures on a wide range of subjects, downloadable in pdf format.
Magazines.com – Magazine subscription service. Great way to find popular niches. After all, if the market’s big enough to support a glossy magazine then it’s big enough to target online.
Mailing List Database Search – Free mailing lists search tool enables you to search database of more than 60,000 targeted mailing lists sponsored by the Direct Marketing Association
MediaFinder – Online Database of U S & Canadian publications, including magazines, catalogs, newspapers, newsletters & journals.
Paypal Shops – Great place to research and come up with ideas for a profitable niche. Browse through the list of online shops listed for something that takes your fancy.
Pew People & The Press – Public opinion research organization that studies attitudes toward politics, the press and public policy issues.
Pew Research Center – Fact tank that provides information on the issues, attitudes and trends shaping America and the world through public opinion polling, social science research, reporting news and analyzing news coverage.
SiteSell – Lists of sites in various niches that are all in the top 0.5% of web traffic.
Squidoo Top 100 Lenses – Find hot niches in Squidoo, the top 100 lenses based on a combination of content quality, reader activity and freshness factors. Updated daily.
Ranker – This is a site of lists, and has some ’embedded optimization’ in that the lists – great starting points themselves – then get voted on.
TechMeMe – Technology news site – spotlights the moment’s hottest tech stories on a single page.
Technorati Top 100 – Excellent blogging portal. Find blogs to submit guest posts to, get niche ideas and more. Register your blog on Technorati, the home page has a rank of PR8!
Trend Hunter – Community for trends and trend spotting, including fashion, style, gadgets, tech, pop culture, bizarre and design.
Yahoo Clues – Find out what people across the web are searching for. Check and analyze trends.
Yahoo Groups – Groups, clubs, forums and communities. See what’s being discussed and what’s hot.
Yahoo Recreational Hobbies – Explore sites about a wide variety of hobbies to get niche ideas. Hosted by Yahoo.