Wow, people are looking at playsh!
I've put some context on my homepage, which may be useful reading: http://interconnected.org/home/2006/03/15/playsh
This is the version shown at O'Reilly's ETech Conference in March 2006.
While the code runs, it's released as a snapshot for examining only--there are some big bugs and some bigger security holes (the ssh interface opened to the host machine, in particular).
Work continues on a more accessible release...