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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.

Out of every professional programmer I know, probably 1% use PHP and 90% use Rails. (The other 9% use either Python or Clojure or something more exotic.)

It only mentions the very biggest players. While Rails is popular on HN, it doesn't surprise me that compared to PHP, ASP, and Java, it doesn't have much market share.

Who made that chart? Where's Node.js? Just kidding, Node fan here ;)