Gallery2 gives you an intuitive way to blend photo management seamlessly into your own website or simply use it as a gallery... surely there is a gallery3 see http://gallery.menalto.com/ but I like gallery2.
Here is my steps.
cd /tmp wget http://downloads.sourceforge.net/gallery/gallery-2.3.1-full.tar.gz tar xzf gallery-2.3.1-full.tar.gz sudo mv gallery2 /usr/share/webapps/
sudo emacs /etc/httpd/conf/extra/httpd-gallery2.conf Alias /gallery2 "/usr/share/webapps/gallery2" <Directory "/usr/share/webapps/gallery2"> AllowOverride All Options FollowSymlinks Order allow,deny Allow from all </Directory>
sudo /etc/rc.d/httpd restart
At some point during installation you need to verify your server writeablility.
sudo echo "RANDOM KEY" >> /usr/share/webapps/gallery2/login.txt