The Computer Language Benchmarks Game is a collection of 429 programs, consisting of 13 benchmark reimplemented across 33 programming languages. It is a fantastic resource if you are trying to compare programming languages quantitatively. Which, oddly, very few people seems to be interested in doing.
I dislike PHP. It's because it's users. The lecturer tells about xss among others and guess what his site suffers from? sigh.
a nice blog entry on php code quality and why their security team went on the run (via fefe)