Asterisk2Go is a new VirtualBox application, to provide an good start to setting up the Asterisk telephone server. First release can be downloaded here: http://dl.dropbox.com/u/54016165/Asterisk2go/asterisk2go.ova
Asterisk can be used almost any phone setup you could wish for, from the simple system with a small internal ip phone net within your home, to a company setup with call groups, queues with music, and menus operated by phone keys.