httpd can't open library: /usr/lib/libbz2.1.0.dylib (No such file or directory, errno = 2)
So I turned to an old version of MAMP for PowerPC (OS X 10.3.9) and installed WordPress 3.1.1. Worked great until I tried http://binxbinx.local:8080/wordpress/ from another machine and I saw the unformatted text of the pages.
Anyway, all you have to do is go to your wordpress settings