23 Programming Languages compared through their Amazon book sales

Saw this link: 23 Programming Languages compared through their Amazon book sales and found it rather interesting.

Not sure what it proves. On the one hand, it might show programmer interest. I know a lot of people are really into Ruby. It also makes it clear that Java/C/C++/C# and VB are still dominant. Still, I wonder how much this may be influenced by existing code bases. Ruby being number #3 with so little legacy code is really interesting. I’m going to have to give it another look. Also, the poster was nice enough to list the problems with his survey, which is really nice.