When I do phpinfo I get no mysql section on the page and in my apache log I see below error message. I have the extension uncomented in the php.ini, and the correct dll extension files both apear to be in the folders.
[Fri May 23 02:27:05 2008] [notice] Parent: Child process exited successfully.
PHP Warning: PHP Startup: mysql: Unable to initialize module\nModule compiled with module API=20050922, debug=0, thread-safety=1\nPHP compiled with module API=20060613, debug=0, thread-safety=1\nThese options need to match\n in Unknown on line 0
[Fri May 23 02:27:07 2008] [notice] Apache/2.2.8 (Win32) DAV/2 mod_ssl/2.2.8 OpenSSL/0.9.8g mod_autoindex_color PHP/5.2.5 configured -- resuming normal operations