Random House's Insight digital book distribution is a really neat trick that allows users to search individual titles or entire book databases. Plus it allows book sales sites like Amazon.com as well as other websites and bloggers can insert Insight's widget into their sites to allow the same searches and previews. Their service could revolutinize the way books are sold on the web.
They are now offering their Insight program to other publishers under the direction of Mike Shatz, their digital vice president. For more information, check out http://www.randomehouse.biz.
One drawback to their service. Users have to update to Flash 9, but that's probably a good thing for users all around.