I suspect the 'fun' thing is a bit of a stab at the frequency of the 
word 'fun', as well as the 'programmer happiness' thing in Ruby and/or 
Rails evangelism. I myself don't like such terms too much when used to 
describe what I do.
I love my work, and some of it now involves ruby, but 'fun', in written 
english, has connotations that perhaps do not suit the way myself and 
like-minded people describe how we feel about our work. I would use it 
in conversation, but I would not use it in a banner advertising my 
working environment.

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