Various measures have been proposed for tracking the popularity of languages. Measuring the adoption of a programming language is an inexact science, but key indicators (job adverts, stack overflow tags, open source contributors) all point to rapid Scala adoption. Data gathered from indeed.com, stackoverflow.com and ohloh.net.
Cape Coder 
“climb rapidely” was true when comparing 2011 to 2010. Not true when comparing 2012 to 2011, at least not yet.