About a 12 months ago, Google took their old keyword tools (Legacy Keyword Tool; Beta Keyword Tool; Adwords Traffic Estimator; Search Based Keyword Tool) and mashed up a single new tool, the new, improved Google Keyword Tool, and began beta testing.
So, what’s the difference?
Old Google Keyword Tool
In a nutshell, the old tool used data from regular Google searched and from the Google Search Network. That means that search data from second tier search engines (like AOL.com, DogPIle.com, and the like), ISP partners (like Comcast.com), Google Properties (such as Google Maps), and other partners (like Amazon.com) were all included.
New Google Keyword Tool
The new Google Keyword Tool only uses search data from Google.com and regional sites (like Google.co.in).
Which Keyword Tool is Better?
Depending on you point of view, this new data set could be better or worse. But it’s certainly going to be a more conservative traffic estimate. But good keyword analysis still works pretty much the same way.