Homepage: http://www.common-lisp.net/project/definer
Essentially it allows for a (let's say it!) Pythonesque, or better, a Dylan-like syntax for variuos definition forms. E.g.
(<b>def</b> <b>var</b> foo 42) (<b>def</b> <b>class</b> panda (animal)) (<b>def</b> <b>struct</b> tree-node content left right) (<b>def</b> <b>method</b> bar ((x string)) (print x)) (<b>def</b> <b>method</b> bar :after ((x string)) (print "Just printed a string!"))
convenience library