There are at least eight FREE state research guides on the Ancestry.com website - see the list here (I'm not sure that it's up to date). Here is Ancestry.com's description of these state research guides:
Ancestry.com has a page for Free Research Guides in the Learning Center under the Next Steps tab - here is a screen shot of the top of the page:
There are many articles on that page for different localities and record types. But not the list of free state research guides.
Interestingly, it is very difficult to find all of these guides without a link from some other source. Ancestry.com should put a link to one page with all of their guides in their "Learning Center" tab on their menu bar on the top of their pages.
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Copyright (c) 2014, Randall J. Seaver