The Perl books I use most are the Camel and the Cookook. Unlike some other monks, I find Perl in a Nutshell all but useless, and wish I had the money back. perldoc is more complete and more up to date.

When I was doing C++, my favorites were The C++ Primer Plus by Prata and the Schaum's Outline for C++, which had the best section I ever found on strstreams. I haven't done C++ since 2000, though, so I don't know what's good these days.