As the subject says, for more info visit the project page:

http://common-lisp.net/project/patty/

documentation:

http://common-lisp.net/project/patty/patty.html

It's asdf-installable, the latest is available via darcs:

darcs get http://common-lisp.net/project/patty/darcs/patty

Patty is released under a BSD-style licence.

It's almost too small for all the fuss :-)

Stefan