Comment by mitchellh

Yes, there are plans for a central repository of boxes, but its not an "immediate future" plan. We'd first like to focus on getting Vagrant as stable as possible on the common-case systems.

Hm, changing the IP of the VM. This can't be done via the Vagrantfile at the moment no. But if you do change it manually, you can configure Vagrant to use that VM with "config.ssh.host"

Mitchell