Harrumph.
FORTRAN is not a flower but a weed -- it is hardy, occasionally blooms, and grows in every computer. - Alan Perlis
Reading the gardeners list makes me feel like a weed-planter more than a gardener. When I look at a project like wxCL I do not see a flower yet to bloom. I see a weed, and not a particularly hardy one at that: a GPL'ed interface library to a common GUI toolkit that I can hardly stand to use on my platform poison of choice for a Lisp I never use. So many other comments inspire the obvious retort to the question which is so common that I do not need to state it: Common Lisp is not a single-implementation language. Take that as you will.
If there were one Common Lisp which I could run on every platform - one which provided portability for applications using threads and doodads and whatsits without requiring me to GPL my code because I use some internal interface of that implementation - I would probably use it, even if it provided less performance than my current lisp of choice. When it comes down to it, I rarely need performance. No such flower or weed exists yet. If I were to plant it, I would not plant it in the garden of Common Lisp. For as much as I love working in this language I would not take the opportunity to implement any of the obvious advances in language design in the past twenty years and pass it by just to implement ANSI Common Lisp.
Lemonodor reports that ten of my ASDF-INSTALLABLE libraries are 404s. Both of the users of my released libraries have already complained to me over IRC. Just to clarify, though: my server is not down. The server that was is toast: not French toast, a breakfast delicacy, but a kind of stale, burned toast which emits a foul odor of smoke. A new plate of bread has arrived from the kind servers of tech.coop and will yet turn into something edible. In the meantime, try checking out from svn://unmutual.info/theproject (change theproject as appropriate), and if that doesn't work, email me and I'll figure out if I have any backups of what you seek.