It's interesting to read the comments. Many mention that Ruby is still growing, but I have the feeling that its already peaked and now fading[1]. I also thought that NoSQL was just a silly fad, mostly being laughed at[2].
* Python still has a viable niche (scientific computing, stats, etc...)
* Ruby's niche (mvc websites) got copied by every other decent language
* Ruby is in decline relative to Python: http://www.google.com/trends?q=ruby+language,+python+languag...
http://www.youtube.com/watch?v=up0kiOJvUpI
* One more link for you