Hi everyone,
I have just uploaded a first release of ContextL. It's both a non- trivial example of using the CLOS MOP and a full-fledged library in its own right, providing constructs for context-oriented programming. See http://common-lisp.net/project/closer/contextl.html for more information.
In the mid-term, this is supposed to supersede AspectL since it provides all the important features of AspectL in, I think, better variants (except for the generic pointcuts).
Cheers, Pascal