Sorry for the confusion. There was a problem with the site today, but it should be accessible again soon. In the meantime, the example files are available here or you can download a zip file of all the examples.
The Missing CD page, which has resources besides the examples files, will be reachable at http://missingmanual.com/cds/9780596527600/ once the site is working again.
For most of our books, you should be able to find links to the Examples or the Missing CD on the book page, below the image of the book's cover.
I'll let you know when the link is working again.
O'Reilly Media, Inc.