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Memory upgrades are as easy as hard drive upgrades. Just one command than the user has more ram. But what if the server is full and you don't have any more ram? No problem. Just copy the user's VE container (virtual environment) over to another physical server with rsync and start them up there. In only a few minutes you've migrated them to a new box and they are up and running.

Suppose a customer just needs a bigger server. Migration is easy in the container environment because the VE container is consistent between servers. You just copy over the files and start it up. You don't have to build a new server, install an OS, copy it all over, and then mess with it for an hour getting everything to work.

OpenVZ allows you to migrate servers live from one physical server to another. I haven't yet done that but I have done a shutdown, copy, and restart of the VE container on another server and it's so easy to do that. So suppose you have a server that's a little crowded and some user starts hogging some resources. No problem. You just move a few users to another box and problem solved. This could probably be done automatically with some well configured cluster and I would love it if someone wrote a wiki page telling us how to do it.