Vladimir Sedach has a post up that describes the
cl-test-grid project. The idea is that Quicklisp users download the
cl-test-grid, tell it what CL implementations are available, and run the test. It runs tests against many of the libraries in the latest Quicklisp release and sends the results to a public report site and a bug tracker site.
This is a way of helping library writers get their libraries tested in as many environments as possible. It seems like a good idea so if you are willing to donate a few cycles it's a worthwhile exercise. See Sedach's post for details.