Navy Officer Promotions
http://usmilitary.about.com/od/navypromotions/l/blofficerprom.htm
Navy Enlisted Promotions
http://usmilitary.about.com/cs/navypromotions/a/navypromotion.htm
The official Navy site was useless! But About.com is usually a pretty reliable source and the first article is actually from the Navy's "All Hands" magazine.
That's it, tadpoles, I'm checkin out of the google business for tonight. :)