News about Aptsh can be obtained on Freshmeat.net.
You can download Aptsh from Debian.
Documentation can be found inside the packages, but the Howto is accessible here as well.
You may also find the page of Aptsh on BerliOS interesting.
Current code of Aptsh is kept in Subversion repository. Like any other serious Subversion repository, it is accessible through a web interface. It can be viewed directly, with ViewCVS, or with WebSVN.
Contact: wrochniak at gmail