Do you mean clever thing to do with it, or literal hacks? For the later the the movemail exploit, as documented in Clifford Stoll's Cuckoo's Egg book was prett

Do you mean clever thing to do with it, or literal hacks? For the later the the movemail exploit, as documented in Clifford Stoll's Cuckoo's Egg book was pretty good. I reported a couple of trivial predictable-filename issues with bundled lisp too - including one that was related to Mosaic which dates pretty badly: https://bugs.debian.org/747100 https://bugs.debian.org/747100 I guess "neat elisp" is such a wide topic people can and do write lots on the topic. I'll just say "org-mode is awesome".