Keep in mind that the level of hype often doesn't correspond to the actual amount of usage a technology experiences.

Yes, Ruby on Rails has been widely and frequently publicized. Yes, there are some people who have a semi-religious devotion to Ruby on Rails, and are quite vocal about it. Yes, a number of books have been written about it. Yes, training is available for it.

But in reality, we really don't see it used all that much, at least compared to PHP, Java, and ASP.NET. The numbers given in that graphic may not be exact, but I wouldn't be so quick to rule them out, either.