The latest official release of FFTW is version 3.2.1, available from our download page see the release notes for what s new. (Subscribe to the fftw-announce mailing list to get release announcements.)
This release has better threading support, faster real-data transforms, faster transforms for non-power-of-two sizes with factors of 5 and 10, and support for Cell processors (see the FFTW for Cell page)
