pg is a shell script wrapper around GIT to help the user manage a set of patches to files. pg is somewhat like quilt or StGIT, but it does have a slightly different feature set. For one thing pg may not have everything you want. Yet. On the other hand pg does things differently then StGIT. :-)
Right now the documentation is in plain text and available here as well in the public GIT repository.
You can download the latest pg by cloning my public repository:
git clone http://www.spearce.org/projects/scm/pg.git
Bug reports should be sent by email directly to me: firstname.lastname@example.org
I'm also interested in hearing feedback about the command set. What works for you and what doesn't, what features could be improved, what features you'd like to see, etc.