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Gerrick W. addressed an interesting difference point between Overture and WordTracker keyword internet marketing tool. The difffernce point are concenstrated on the keyword research result between both of keyword internet marketing tools. The title of article is "The Different Keyword Search Results Between Overture and Wordtracker".

The detailed information can be found as follows:

"Overture
It is a Pay Per Click Search Engine. According to Overture, its statistics of searches in previous months are compiled from its partners, which include AltaVista, Yahoo, MSN Search, HotBot and All the Web. So the statistics from Overture are broad based because it has a larger network.
Its data, though, has some drawbacks.
1. There's no distinction between...
a. Singular and plural terms.
You have to figure if surfers are searching for the singular or plural form of the keyword.
b. Upper and lower case.
c. Human queries and automated queries.
Queries by automated bid optimizers, position and ranking monitors, link popularity analyzers are registered as hits.
2. Duplicate Searches
For example a person doing a search for a particular key phrase in Yahoo, and then in MSN would be registered as 2 hits.

Wordtracker
It is a keyword generator and analyzer, and it does not have direct access to the major Search Engines' databases. Wordtracker gets a lot of its analyzer data from Meta-crawler and Dogpile, which are meta search engines. Metacrawler and Dogpile search the major Search Engines like Google, Yahoo, MSN Search and Ask Jeeves, and retrieve the best results.

The data of Wordtracker, mostly gathered from Metacrawler and Dogpile, represents only a small percentage of total searches on the Internet.

Wordtracker has about 350 million searches over an 8-week rolling cycle (Source: Search Engine Workshops Weblog, June 30, 2005). Now for some Maths. 350 million searches over 56 days would give an average of 6.25 million searches per day. Google with a share of 36 per cent of Internet traffic (Source: comScore qSearch, July 2005), registers about 112 million of searches per day (Source: Top Ten list, Wordtracker). So in comparison to total searches on the Internet, Wordtracker represents only 2 per cent.

When Wordtracker returns zero query for a particular search phrase, it does not mean that no one searches for it on the Internet.

However, with Wordtracker, automated queries are not added to searches, and duplicate searches are eliminated. Singular and plural, upper case and lower case search terms are distinguished except for keywords where singular, plural, lower or upper case, are similiar in meanings eg.'keyword' and 'keywords'.

Overture or Wordtracker?
For Overture the figures are inflated, whilst for Wordtracker they are under reported. Nonetheless, these are helpful tools for keyword research and selection. Use these figures as guides, and not absolutes to make comparisons in your choice of key words.

For example if keyword phrase 1 has 10,000 searches in Overture, and keyword phrase 2 has 2000 searches, then it is obvious that key phrase 1 would bring in more traffic if your web page is properly optimized. But don't expect 10,000 visitors with key phrase 1."

Personally, I believe that Overture keyword internet marketing tool is suitable for you to get the overview of your keyword phrases and the popularity of your focus keyword phrases. Meanwhile, WordTracker keyword internet marketing tool allows you to find more niche keywords & expand your keywords list easier than Overture. As my experiences, WordTracker is better than Overture if you are looking for niche keywords and expand your keywords list.