We have a free auto-installer for Debian Linux and Asterisk, for non-Linux pros that want to check Asterisk out. It basically installs your computer from scratch. It taked about 10 minutes to install and in the end you have an Asterisk station (without any configuration, but it will have a default configuration in the next version which will very soon come out).
It is FREE to download from:
www.xorcom.com