Comparing bibliographic databases

We have begun to compare search results and search options in 4 online bibliographic databases:

Amazon.com
boooks.google.com
Librarything.com
Worldcat.org

As a first step towards systematically comparing these databases, I would like us to compile a list of sample searches to do in each database. Members of this task force can enter names, titles, and keywords they would like us to try in our wiki. If others on this list have ideas or suggestions feel free to add them as comments to this post.

The new OPACthing

The Librarything has announced that they are going to market java widgets that can be used in conjunction with commercial OPACs to provide additional information to library patrons. Tim posts on the Librarything's blog, "The paid widgets will include book recommendations, tag-based browsing, ratings, reviews and so forth." They are offering a FRBR inspired related editions widget for free. This widget uses their ISBN data to collocate related records.

It is unclear how widely it will be used, if it really will be as easy as they claim, and what it will cost. However the announcement continues a trend of third party companies (Endeca, Acquabrowser, etc.) offering to enhance library OPACs. I believe it also Librarything's first formal step into the world of traditional libraries. Tim Spaulding at Librarything once hinted that he thought they might one day compete with OCLC. Stay tuned...