I'll expand this page as I have time and come across random bits that might be of use to someone.
A potentially useful one is my hack to allow Microsoft Frontpage 2000/2002 "extensions" to run under Apache on Linux without having to be setuid root. (I am definitely NOT comfortable with running a Microsoft binary for which I have no source as root on my server with it fielding requests from the outside world. Microsoft's security record is a bit short of stellar, and as they're clearly not motivated to make Linux look good, I rather doubt that they've put more effort into making the Linux FP support secure than they have on things like IIS and IE.) The short version is that I configured Apache to run CGI's as the user who owned the site that was using Frontpage, and modified the FP version of suexec to know that if it came up already being the user it needed to be, it didn't need to do anything, and voila! My users could have all the FP security holes they wanted without endangering the whole box or the other users. I'll post the details when I have a chance, but if you come across this in the meantime and need them get in touch with me via the contact form (see the link at the bottom of the page).