First time I've tried this... Using MAMP, I got through the steps here just fine up until step 4. I had 3.3 downloaded, and unzipped it into username/sites/wordpress/ as the instructions suggested. I modified the wp-config-sample.php file as follows:
define('DB_NAME', 'wordpress'); define('DB_USER', 'root'); define('DB_PASSWORD', 'root');
Everything else is the same. (And it's set to localhost for the host/server line.)
Help? This seems to be a common problem but the solutions are all different, and they're not working for me.