Web And Database Synchronization?

crazney asks: "I am developing a medium sized Web site with a friend, and we have stumbled across a small problem. Our hosting will consist of several Web servers load balanced, and possible two or three database servers. The extra database servers may be used for load balancing or for redundancy. My question is, what can we use to keep these up to date? We would like to ensure that all the Web servers always contain an exact same copy of the Web page, and any changes to the database affect the others. These servers may be geographically separated, so something low bandwidth would be helpful. For the Web servers, a quick and dirty way could be CVS, but I'm stumped for the database servers (which will probably be running PostgreSQL)."