Link to snapshot by blogger and displaced New Orleans resident Jonno d'Addario. He explains in the comments on that Flickr page:
[There were] 1086 pages of residential listings (= above the blue line) in the 2004 directory vs. 765 pages in the new one. Page thickness seems the same as far as I can tell. What's also interesting is that the 2007 directory has a Lasik surgery banner ad (?!) on the top of every page, reducing the number of listings per page to 250 or so; there's an everage of about 300 listings per page in the 2004 directory.
Update: The image seems to have been deleted from Jonno's stream, and he has no idea why (no notice from Flickr people — feel free to chime in if you're reading). Here's a screengrab: Link.