If your local Web server was running Apache/MySQL/PHP before installing Leopard and is suddenly dead to the world, here are the quick steps to get it working again. Mileage may vary.
1. Edit /private/etc/apache2/httpd.conf using your favorite text editor.
Line 114: Uncomment (remove the "#" from in front):
LoadModule php5_module libexec/apache2/libphp5.so
Line 203: Edit the "None" declaration to "All"
AllowOverride All
2. Save and close the file.
3. From Terminal, run these commands (requires administrator password).
sudo mkdir /var/mysql
sudo ln -s /tmp/mysql.sock /var/mysql/mysql.sock
sudo apachectl restart
4. Toss all of the junk thrown in the /Library/WebServer/Documents/ folder. You can keep the Apache logo and the "Powered by Mac OS X" button if you are feeling particularly proud of your accomplishment.
The great news about the update is that it does not require any further configuration beyond that unless you need a fairly specialized platform. They have included PHP 5.4.2 and Apache 2. You will have to provide MySQL, but its a quick and free download. They have also cleaned up the config files quite a bit so that only the most commonly changed features are in that main file. Everything else is buried in other folders in the /private/etc/apache2/ folder.
While I did not get a T-shirt (pre-ordered), I am pleased with the update.