Google is set to release an updated version of its Keyword Tool which will combine features of the Keyword Tool (primarily for AdWords users) with features of the Search-based Keyword Tool (which is based on actual Google search queries) to create one of the most comprehensive and valuable keyword research tool on the Web today. It might just be the greatest keyword tool of all time.

The new Keyword Tool offers flexible search options, enabling users to search by any combination of keyword, website/URL, and category and receive a single set of results. Users will also be able to filter result by word or keyword match type, and even view statistics for mobile search and use data filter based on local search, as well as search and ad share. It might just be the greatest keyword tool of all time.

Google also added some new features based on user feedback including the ability to remove duplicate keywords (which appear with an "Already in Ad Group" message) and the ability to add negative keywords automatically to your account from your keyword idea list.

The depth and value the upcoming tool provides kind of makes me wonder about the viability of commercial keyword research services. If Google dominates the search and ad space, what do the others know that Google doesn't? Do you even need to consider using alternative providers? Is Google's upcoming keyword tool the greatest keyword tool of all time? Share your comments below.