TIOBE Software: Tiobe Index
http://www.tiobe.com/index.php/content/paperinfo/tpci/index.html

Feb 2011　Feb 2010
1 1 Java 18.482% +1.13% A
2 2 C 14.986% -1.62% A
3 4 C++ 8.187% -1.26% A
4 7 Python 7.038% +2.72% A
5 3 PHP 6.973% -3.03% A
6 6 C# 6.809% +1.79% A
7 5 (Visual) Basic 4.924% -2.13% A
8 12 Objective-C 2.571% +0.79% A
9 10 JavaScript 2.558% -0.08% A
10 8 Perl 1.907% -1.69% A
11 11 Ruby 1.615% -0.82% A
12 - Assembly* 1.269% - A-
13 9 Delphi 1.060% -1.60% A
14 19 Lisp 0.956% +0.39% A
15 37 NXT-G 0.849% +0.58% A--
16 30 Ada 0.805% +0.44% A--
17 17 Pascal 0.735% +0.13% A
18 21 Lua 0.714% +0.21% A--
19 13 Go 0.707% -1.07% A--
20 32 RPG (OS/400) 0.626% +0.27% A--