MySQL: Save RAM by disabling InnoDB

If you run a MySQL Server and have not much RAM, like in a OpenVZ Container or VirtualServer, there is some saving possibility by disabling InnoDB in your my.cnf.
By default InnoDB Engine is enabled and uses about 100MB of RAM. You can disable InnoDB in your /etc/mysql/my.cnf with the keyword "skip-innodb".
But check first if there are any databases with InnoDB Tables in your MySQL Server. They will stop working if you just disable it.