freeflight2 - 11:29 pm on Mar 3, 2005 (gmt 0)

it's possible... our DNS currently contains 6-8 IPs pointing to servers in differnt DCs
We use nsupdate to dynamically add/delete IPs with a TTL=300 and a 3rd party for DNS hosting.
Modern browsers actually automatically try a different IP to reach the site in case a box goes down.
Much more difficult is to spread mysql DBs over several servers and to implement automatic DB failover / recovery.

You might also look into linux cluster solutions and some hosting providers also offer "cluster packages" and do the whole job for you.