Joshua Eichorn posts a quick note today concerning the source code for his upcoming "Understanding Ajax" book (from Prentice Hall Publishing).

All the code shown in Understanding AJAX is now available from understandingajax.net. You can run the examples on my server or download them and set them up on your own. If you run into any problems leave a comment on this post.

The book's site provdes each chapter (two through twelve) in zip files for easy download as well as a single zip file download if you just want them all at once.