Same fftw source code, but now both single- and double-precision versions of the libraries and header files are generated, using the "type prefix" feature to distinguish them. That is, the single-precision files are named libsfftw.a, libsrfftw.a, sfftw.h, srfftw.h while the double-precision files are named libdfftw.a, libdrfftw.a, dfftw.h, drfftw.h. In addition, there are files without type prefixes (libfftw.a, librfftw.a, fftw.h, rfftw.h) which are symbolic links to the double-precision versions.
Same fftw source code, but the binary distributions now exclude the libtool "*.la" files, which are non-portable (and not really useful for these static libraries, as far as I can tell).
Also, the Makefile has been modified to be tolerant if an error occurs while building the documentation (fftw.ps).