Hiya! i'm not sure where to post bugs related to the Learning jQuery book, so i'll drop it here:
Page 309 says: "The jquery.com Plugin Repository at http://jquery.com/Plugins/ is a great place to start when looking for documentation." That URL is a 404, though - "plugins" should be lower-case. Perhaps the webmaster can adjust for that, rather than waiting on the next edition of the book. :)