So, this is what I did. I simply entered various arbitrary programming languages into the main search at Dice and Monster. I specified no other search criteria, so, the term exists either in the title or other meta data about the job. I'm sure this creates some noise, but if we can suspend and accept the concept of random sampling, this provides some interesting results. Note that the results here are from Dice, but Monster's results were similar.
Obviously, I am not a statistician and I certainly do not have the resources to pay for a Gartner consultation - I barely have the time to update my resume. However, based on my naive searches and lack of any domain context, is it fair to conclude that if I know Java reasonably well, I am more employable? Of course, this is the demand side of the equation. What about the supply?