How many programming languages/development frameworks are you currently using?
apgwoz: Perl, Python, PHP, JavaScriptMovable Type, with Perl.
Some Django, and non-Django stuff with Python. 
Hacking on Active Collab, written in PHP. 
Rely heavily on jQuery for JavaScript these days.
Chicken Scheme for some random exploration now and again.I've become pretty good at context switching between them all. I make mistakes sure, but I don't spend more than 5 seconds writing JavaScript in a .py file.