On the Worldcat site I chose the book "Ava's Man" by Rick Bragg.  There were 7 results and 2,268 libraries worldwide have this book.  The "top" library was the Alexander Mitchell Library.  The class descriptors were:  LC:  CT275.B78516 and Dewey:  975/.042/092;B

Other books by this author included:  "I am a Soldier Too:  the Jessica Lynch Story", "All Over but the Shoutin", and "The Prince of Frogtown".

The subject list was a list of related subjects with a percentage next to it.  The top subject on this list was "Alabama".  After clicking on this another list showed up.  This list included books, serial #s, archives, maps, etc. relating to the state of Alabama.

This site would definitely be beneficial for those doing research on virtually any topic.  Also, if you were impressed with the author you could find what else he/she had written.  Even if you weren't impressed with an author, you could at least find some more information on the subject the author had written about.

On the OAIster site, after searching South Dakota, I went to the link "Facts on Kids".  Up popped various state agencies and I chose the South Dakota fisheries under the Game, Fish, and Parks.  I perused the report on Lake Oahe.  Included was information on different fish populations, harvest surveys, stocking reports, etc.  Why this was under "Facts on Kids", I'm not sure.  I do think this site would be good if you are looking for some statistical data on any number of things.