Java has its detractors, but according to a recent reading of the Tiobe Programming Community Index, it's still the dominant programming language, with little change in its overall popularity since August 2007. Runners up? C, (Visual) Basic, C++, and PHP.
That's the short-term view of the past year. Looking at the longer-term view, however, Java, C, and other "traditional" languages appear to be on the decline while PHP and its ilk are on the rise: