Not the most sound method but I was demonstrating the relative popularity of programming languages to my SO the other day using find in the Who's Hiring thread for May and python was the most popular.

Surprised me as well.

A ton more companies have some Python scripts than Python as a primary development language; this skews naive keyword matching assessments of job postings.

What is then?

One thing that's always bemused me is that YC doesn't insist on its companies using Lisp :-)