For these images, root's password is "p4ssw0rd". The Debian image also has an
user called "user" with the same password.

Minimalism rulez: these are small (512MB) images, half filled. No X, no
sources, no ports/packages, and no MP kernels. Just base system binaries.
Default choices everywhere.

Minimum services: getty listening to the serial console, cron, and sshd
listening to 22/tcp.

Networking: configured to Just Work (TM) under qemu defaults.

You could use a script like qemu.sh to start these images for you. They can be
used to try new systems, or as extremely powerful (and a bit resource-wasteful)
chroot jails... just don't expect great performance :-)

Have fun.


-- 
Guillem