Ancestry.com is offering a collection of US Probate records free through 7 September. They have a free research guide available for download at c.mfcreative.com/mars/landing/probates/…
Just found a will from 1899 that matches up with a whole group of records, validating the inferred relationships between the 1880 Census records and the 1900 Census records for one of my families.
Strongly recommend the research guide for the Probate collections, since it has instructions for the controls on the new viewer at the bottom. http://c.mfcreative.com/mars/landing/probates/ProbatesResearchGuide_final.pdf