PL/SQL is in 33th in TIOBE Index for February 2011. It's was in 23th place in December!
A drop of 10 places in 2 months!
In 2008 and 2007 in February it was in 13th position in the index.
In a previous post I already wrote about some of the reasons that I think is not allowing a better position of the PL/SQL language in this "popularity" index.