Recently (as in the last couple of years, not as in the last few weeks), publicly available Common Lisp libraries have undergone not only an explosion in numbers, but a rather bizarre change in release model. More and more libraries are essentially only available as "check out the latest version from VersionControlSystemOfChoice".
Since I am a writer of assorted nonsense, I wrote a short piece on this, trying to articulate why I find this less than ideal and how it could, possibly, be turned from less-than- ideal to much better.
Personally, I try to release my own stuff in versioned tarballs, with an ASDF system definition having a matching version number. I suspect I should modify my release packager script to actually modify a list of stuff available, instead of having a couple of static pages I almost never edit (note: the packaging script makes some rather rash assumptions on the organisation of your source code and relies on a couple of magic files being up-to- date; your source code is probably not organised like mine is)