Microsoft released a monster 64-mb keyword research tool tonight - download it here. The free tool, still in beta, is a culmination of research conducted at their Pac Rim adLab. It's called the Microsoft adCenter Add-in for Excel 2007 - and (obviously) you'll need Excel 2007, which Microsoft offers as a 60-day free trial.
Plans for the product were discussed in December at Search Engine Strategies Chicago.
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