Round Robin DNS

I would like to get your comments on pros and cons on using round robin DNS to load balance web servers that are located in geographical disperse locations? What current technologies you are using to run disaster recovery? Says we have site A and site B, if site caught a fire, all web browser will be redirected to site B web server only. We are planning to use round robin DNS with BGP to achieve this, is there a better way to do this? Thanks. Suan Jong Yeo Network Engineer Aurum Technology ken.yeo@aurumtechnology.com