One thing that would be cool is to have an offline version of this documentation. I have the Common Lisp HyperSpec installed locally on my computer so that documentation lookups happen instantly in Emacs. I also view the documentation with the built-in browser rather than having it open in Firefox, so that I never leave the editor. Doing this means I don't have to worry about internet connectivity or the two usual sites hosting the HyperSpec (LispWorks and lisp.se) going away.