What is the root password on an unmodified NSLU2 with stock Linksys firmware.
The short answer is that we don't know, and we don't want to know.
There are concerns that releasing this information allows people to gain access to any internet visible NSLU2. However, by default the NSLU2 resides on a unroutable subnet (192.168.1.77) which would mean that any attack would have to originate from inside your network. If this was the case then securing your NSLU2 is the least of your problems. Allowing unrestricted access from the internet is also a bad idea. Both possible avenues for abuse result from implicit actions by the user/owner to allow access.
The default administrative access via the web interface is