It's funny that you commented on my post because although I have a very broad range of interests, I've been getting into Information Assurance/network security (specifically, I'm on my school's team doing Active Directory and IIS management for
http://www.nationalccdc.org/).
For the record, I'm not a big fan of AD and IIS, but it's what the team needed.
Also, I do have experience in Python and Django, Ruby (not Rails, I have mild issues with Rails), Scheme (one of my mild obsessions as well), PHP, mySQL, and a few other languages, but I could always make that list longer. I'm playing around with Erlang at the moment, but I might look into ML and/or Clojure soon.
Information Assurance is actually one of the reasons that I'm double majoring in Computer Science and Cognitive Psychology: I believe that people are a huge liability and that something can be done about that risk.
However, the main reason I'm double majoring is because I love the idea of Artificial Intelligence. I do plan on doing AI research at one point in my career.