This is what is available at the Delta County Historical Society Museum. I have just started and hope to be adding more content all along.
http://deltacountyhistoricalsociety.wordpress.com/ - last updated 26 Jun 2018
http://u3afamilyhistory.blogspot.com/ - last updated 7 Mar 2018
Founded in 1971, the Cape Cod Genealogical Society acquires, catalogs, and preserves genealogical and historical information, emphasizing but not limited to Cape Cod.
http://blog.capecodgensoc.org/ - last updated 23 Oct 2017
This is the blog for the Records Preservation and Access Committee, a joint committee of the Federation of Genealogical Societies and the National Genealogical Society.
http://www.fgs.org/rpac/ - last updated 8 Oct 2017