Comment Sources that track Programming Language Popularity (Score 1) 897
From Wikipedia article on "Measuring programming language popularity":
"Combining and averaging information from various internet sites, langpop.com claims that in 2008 the 10 most cited programming languages are (in alphabetical order): C, C++, C#, Java, JavaScript, Perl, PHP, Python, Ruby, and SQL." Checking the site now, this set of languages appears to have held steady ever since then.
Also the TIOBE index is good, but it based solely on search frequency. However it is updated once a month: http://www.tiobe.com/index.php/content/paperinfo/tpci/index.html