1. Alexa.com Global Top (most popular) 500 Web sites. These are updated daily. Top 100 Web sites by country option is also available.

2. Overture.com Enter a Keyword (relating to your site). You are given the amount of searches done in a particular month for that search term. You are also given other keywords related to your search term and a count (no. of searches for the month for that keyword term).

3. Wordtracker.com You are given the option of a free trial or a paid option. On the free trial you have to wait for a password to be sent to your email account before you can do any keyword searches. You have a limited time to do keyword searches. They do however say you can repeatedly use the trial. On the trial version you are limited to what words you may use (you can't use sexaul related words). With the trial I also have a free report sent to my email every Tuesday. This report consists of: 1. Top 300 surge report (which was taken over the past 48 hours. 2. Top 200 keyword report (taken over the past 90 days). These reports also exclude words of sexual nature.

4. Quantcast.com Top 1 Million US site rankings.Gives you the no. of unique visits per month. When you click on one of the sites, you get a brief describtion of the site. You also get a breakdown of the traffic: Estimated monthly traffic, daily US uniques, audience composition, share of visits, gender, age, household income and ethnicity.

5. Ranking.com Not as detailed as Quantcast.com You get: Trust guage score, no. of links pointing to a site, link popularity ranking per million, unique users per million, visit sessions and page veiws per million.

6. Googlerankings.com Some works.

7. Google hot trends You can see a list of todays top 100 fastest rising search queries in the US (news trends).

8. Promotion World.com You can cheack your website ranking (or other sites) on Google. Same as googlerankings.com

9. Web 100.com Top 100 websites on the world wide web (www).

10. Searchy.co.uk UK search engine top searches.

11. Local.co.uk Top 10 uk searches.

Wordtracker is by far the best research tool on the web. You can download the most popular keywords.