This is awesome. Hopefully it will take off. Here's a list of recommended libraries:

http://www.cliki.net/Current%20recommended%20libraries

Maybe they should be highlighted in the Quicklisp package list?

I'll mention in passing another solution I've found to the dearth of libraries in CL: run CPython via pipes. Then I can call any Python library I want. I used it for GUIs, downloading stuff from the web, and for doing plots with Scipy/matplotlib. It works great, though obviously has some "bandwidth" limitations.