We just completed a site redesign and the new version was deployed to a different server. The domain name entry was updated and everything works fine. But some users who still have the old DNS value cached are getting the old site. This is expected to happen for a short period. But I want to know what things we can do to minimize this in the future. I'm thinking of tips involving TTLs and things.
Unrelated: It seems that once something is marked community wiki you can't undo it. It was my mistake and I'm not sure if it's good or bad.