There is some wonderful content on the Frankfurt website that everyone should see, whether you attended in person or vicariously through news and blog reports:
Paulo Coelho's speech at the Opening Press conference on social networking, digitization, and the changing role of the author, as well as the video version.
Results of an exhibitor survey on digitization of the publising industry
Photos from the 2008 Frankfurt Book Fair
Bloggers Ed Nawotka, Andrew Wilkins, and Chad Post cover events, parties, and news during the Fair (see the German-language blog here).
Scroll to the second video of the event "Bosses Talk" with Michael Cader (Publishers Lunch), John Makinson (Chairman and CEO of The Penguin Group), Brian Murray (CEO of HarperCollins), and Arnaud Nourry (Chairman and CEO of Lagardere Publishing)