in reply to Intermediate Perl 2nd edition
I have the 1st edition, and considered it a good resource. It's actually already a second-ish edition, as the true first had a different name: Learning Perl Objects, References & Modules, which I also have. :) (Both are alpaca books.) At any rate, this question made me curious enough that I pulled out my copy of Intermediate Perl, 1st, and compared its table of contents with the new 2nd edition. There are a number of differences. The 2nd chapter of the 1st edition has been moved to chapter three, and the using modules chapter promoted to chapter two in the 2nd edition. Many of the chapters in the 2nd edition contain new sub-headings. For example, the chapter on using modules now includes a discussion of local::lib.
The second edition has dropped the chapter on Regular Expression References, but added a chapter on creating your own Perl distribution. The 2nd edition has added a chapter on Moose as well.
If you own the 1st edition, you can wait for O'Reilly to update their website to offer the customary 40% of the latest print edition, or 50% off the latest ebook edition. There's almost always special upgrade pricing. The eBook retails for $31.99, so when the 50% off upgrade becomes available that will drop it to about $16US. No shipping cost on eBooks, of course. That doesn't seem like such a bad deal. Often I'll upgrade to latest editions just to see what the authors considered important enough to change in the new edition, and how they address it.