Keyword Research Tool
Search keywords and find their count, estimated count, and KEI (Keyword Effectiveness Index) in various search engines.

** A filter is available that allows you to filter questionable keywords (adult, warez, gambling and drugs) out of the results so that you'll be on the level with ad networks like Google Adsense and others.

Historical Keyword Data
After a keyword is narrowed down, you can also check its keyword history. You can even break the data down as small as daily trends if you so choose. Interestingly, this is done visually with bar graphs, which allows a quicker synthesis of data at first glance. The service somewhat new, so it currently only allows you to go back as far as August of 2006, but it's still very useful.

------------------------------------
WordRank
A patent pending tool that will analyze the leading sites for keywords and then returning the ranking difficulty, as well as the monthly links that the websites are building. This gives you a handle on just what you need to do to become a contender in the SERPs.

------------------------------------
Other notable features incorporated in Wordze:

Keyword Import
The ability to copy/paste long lists of words to analyze and track later.

Search Engine Digger
Download a deep analysis of over 10,000 websites to find related keywords. A quick check of the term "seo" had 10,000 terms in excel format.

Download Top Keywords
Download the previous week's top 1,000 searches or last month's top 5,000 searches.

Unlimited Keyword Manager
Manage as many keywords as you need in the Keyword Manager. You can even save the results by date or topic.

WordZe is a paid service, with plans starting at $35/month, or a one-day trial for $7.95. However, all TopRank blog readers have been given a chance to take $10 off the original price to drop it down to $25/month.

The developers at WordZe have provided a well thought-out application for keyword research. It's a straightforward, well documented and inexpensive tool for fundamental keyword research.

* Keyword Research
* Industry Keywords
* Spelling Mistake Research
* Seasonal Search Trends
* Related Keywords
* KEI Analysis
* Keyword Density Analysis
* Domain Researcher Tool
* Wordtracker Comparison

AdWords Keyword Tool
This is the same tool that AdWords advertisers have access to from their AdWords console. It lets you get keyword suggestions from Google and information about search volumes (but only in general terms) and pay-per-click bids (only estimates). You can also use it to generate lists of keywords based on a URL, which is useful for seeing what Google thinks your page is really about.

Overture Keyword Selector Tool
The granddaddy of them all, the one everyone mentions. Overture was a company that Yahoo! bought back when Yahoo! thought it could compete successfully against Google. It's slow, unreliable, but it's free so people put up with a lot of crap%u2026 It shows daily search volumes, normally you multiply by some factor (some say 4, some say 8, do your own testing) to get the "equivalent" Google search volume.

Digital Point Solutions Keyword Suggestion Tool
This one generates keywords suggestions from both Wordtracker and Overture and tells you estimated search volumes for each.

Wordtracker Free Keyword Suggestion Tool
Wordtracker is a subscription keyword service, but they offer a pared-down free tool that displays the top 100 related keywords and their estimated search volumes. If you want more data, you'll need to subscribe to their service.

NicheBOT Classic
NicheBOT Classic uses Wordtracker data but displays it quite nicely and provides estimated search volumes for the different search engines.