Please find ipkgs for a console emacs (no x11 or qtopia yet) and clisp at http://www.2gn.com/~jjorgens/zaurus/feed/
For those who are unfamiliar with these packages, here are some brief descriptions.
emacs is an editor that contains a lisp interpreter, mail/news reader, IDE (for many languages), and optionally a web browser. This package is not GUIfied, so you should simply run emacs in a terminal window. It is a very large package compared to other zaurus packages, so make sure you have room before installing it. This build installs in /usr/local which is probably ill-behaved. This package requires libncurses4, although it is not in the dependencies list.
clisp is a common lisp implementation. It seems to be fairly ANSI Common Lisp compliant. This clisp package requires libreadline5 (which is also in the feed).
These packages were compiled on my SL-C3000 with no special flags. Both packages run fine on my zaurus with its big disk, but I don't claim that it will run properly on any other zaurus. That said, if you run these packages, please let me know how you fared.