Why would I care? If you read my blog you know that I mostly enjoy developing in Ruby, Lisp, and Java. That said, I tend to get small consulting jobs using a wide range of programming languages and this is one thing that I like so much about OS X: good support for Python, Perl, PHP, Prolog, and yes, now C#. So we all have our favorite programming languages but computer science is mostly about algorithms, understanding operating systems, infrastructure software, etc.