Google has partnered with some book publishers to allow them to have a co-branded Google Book search engine on their own sites.

"Publishers can tailor the index of their search engine so that only books published by them show up in the query results, Google said Friday. As in the main Book Search site, these result pages give users the option to link to online shops that sell the listed books."

http://news.yahoo.com/s/pcworld/20070603/tc_pcworld/132493;_ylt=ApuyTkGPfyDpVjJ0JZdEYBXMWM0F