[anthk]

The Emacs' bundled documentation on Elisp (both the intro and the rest) are pretty much complete enough.

On Elisp and multithreading/processing, well, just look at bordeaux-threads in Common Lisp where the support is not universal for Clisp. SBCL and ECL work, but...

[shawn_w]

Lots of things don't work with clisp.