Free legal search engine outperforms Westlaw?

Robert Ambrogi's LawSites points to the Preycent legal search engine, which aims to out-perform commercial search engines in searching for legal resources in the public domain.  For the life of me, I don’t understand why blogs link to Westlaw versions of public domain cases, unless, of course, this is just another attempt to remind the remaining dozen Americans that didn’t go to law school that they really have no place reading any legal text and need to rely on silly talking heads in the media to tell them what a statute or decision says (or what their clients want you to think the decision says).