TIOBE has released the 2010 report of Programming Languages index in January 2011.
Tiobe is a main popular site for ranking programming languages. They uses Google, Yahoo, Live MSN or might Bing search engines to measure the popularity of each programming language.
Here is part data of their report:
|Jan 2011||Jan 2010||Programming Language|
You can see at present the No. 1 popular programming language is Java, but C# is the only one language that is keeping growing, Python might be another one which is growing but it dropped lots between 2004 and 2005.
For more detail please visit TIOBE Programming Community Index for January 2011