I really enjoyed reading the How To Write Unmaintainable Code essay which is mostly a copy of the original materials at the unmaintainable code pages from the MindProd jgloss library.
Whereas the essay is all on one page and really easy to read, the original is not: somehow not only the unmaintainable portion of the MindProd site is unusually hard to navigate around. I’m not sure why: maybe that’s why the content is so good?
Try both sources and let me know what you think.
–jeroen