It sometimes touches on Perl.
This article discusses the concept of "undefined behavior" in Perl, drawing in examples from C, Haskell, and XML.
This article is about calculating the square root of a function when all you have is its Taylor series expansion. There's code in Perl and Haskell, and I compare the relative terseness of the two languages. Then I talk about syntax that Perl needs but doesn't have.
Happy birthday, Perl!