A simple metaobject protocol for packages
A sketch proposal of a meta-pbject protocol for Common Lisp packages. It is based on the idea of associating to each package a corresponding class that represents it.
The Idiot's Guide to Common Lisp Packages
A tutorial by Ron Garret on Common Lisp packages. It covers symbols, values and the REPL loop, interning, home packages, exporting symbols and using packages, shadowing, and DEFPACKAGE.