It's nice to know that even wizards can have total brainfarts at times (from BUGTRAQ):
The default behavior of the runtime linker on AIX is to search the current directory for dynamic libraries before searching system paths. This is done regardless of the executable's set[ug]id status.
This story recounts one author's experiment with a Tip Jar system for funding a book. Now, this is good reading because there haven't been enough tests despite all the advocation that these business models gets from people like me. But the book itself is fantastic.