Somehow, the Perl Black Book became my most used and indispensable dead-tree reference. I barely remember, but I think it's what I used to learn Perl. I've since outgrown needing it, but it's worn, coffee-stained pages are still within reach at all times.
in reply to (Perl) Programming Books like the Camel Book
Next on my list is Perl in a Nutshell. Everything in it is available online, but it's still an indispensable reference for the entire Perl core when you're sick of flipping tabs in your browser and searching Google and staring at the screen. Plus, you can highlight it! I bought it as part of the Perl CD Bookshelf - worth every penny if your employer has a nice laser printer :)
Last but not least is Perl Medic. I love this book. Can I say that again? I LOVE this book. It's all about best practices for recussitating ailing perl code written by even the most callous, careless sysadmins and code-manglers. I don't know how best to describe it, but I've read it cover-to-cover more than once and each time I dog-ear more pages and learn new things!
For C/C++, I heartily recommend C: The Complete Reference It is what is says: a complete, no-nonsense reference to C with all the information you'll ever need, and none you don't, organized with impeccable logic and pragmatism. Herbert Schildt's C++ tome is quite worthwhile as well.