Great question Carol!
Here's a current list of
50 libraries using LibraryThing in various ways, so we know they're out there.
I looked at the top three --the ones on 'review enhancements.' I can see that they're pulling in the book reviews from LibraryThing, which is a move in the right direction, imo. I've never seen much potential in soliciting user reviews in every individual library OPAC around the country---the effort is just too diluted. It makes much more sense to link to a central review-prone community.
I can see from all these examples that libraries are using LibraryThing but I would like to know more about how to do it. Do you need the help of a "tech guru"? To what extent is it DIY?