Did you move the location of the PHP folder? Once you compile PHP, you cannot move the folder. If you want, I can compile it for you. My MSN is
msn@trustabyss.com. If you included the --enable-fastcgi in the configure command, it should be working.
EDIT: Download my compiled PHP5 (Mac OS X 10.4) package and unzip it to the /Applications folder. Use MySQL 5.0.77 and it should work fine.
http://www.trustabyss.com/PHP5.zip
NOTE: MySQL 5.1 DOES NOT compile with PHP 5 at this time. I think I will report that to them.