DeskTopLinux has a write-up on the recently released Debian 4.0. Apparently, it's a major upgrade. I've used Debian on a number of servers and have been very impressed. This version has a copy of Astrix phone system installed. This inclusion could make Debian a fast way to test out Astrix.
The release of Debian's newest version is also important because many other distributions of Linux are build using Debian. So expect to see many more upgrades in the near future. Debian is also good about producing CD-ROM images which can be used to run Debian from a CD-ROM for testing purposes. Obviously, one cannot do practical work on a CD-ROM based system, but you can test the look-and-feel of the software.
Another thing you can do with the CD-ROM versions is to run a low-end computer as a firewall. Running the OS from a CD-ROM makes it virtually impossible for a hacker to modify the files. You would still require a hard drive for log files and temporary files. You could use a floppy disk for configuration settings or configure the software before burning the CD-ROM.