Bonnie Shucha at WisBlawg writes about BRB Publications, which has compiled a fairly comprehensive, state-by-state list of free public records sites, as well as an index of national sites and another for Canada and U.S. territories.
Bonnie discovered BRB’s site through Genie Tyburski’s article, Tools for Finding Public Records, which lists a number of useful resources.
Other public records sites I’ve written about before include Pretrieve (which I wrote about here and here) and Search Systems (which I wrote about here).