What's the magic ingredient?
Perl.
update, to be more verbose - it is perl which gathers so much fine people here. The site was established, is maintained
and driven by a bunch of great hackers and those following their steps. Which leads
to all the benefits this site gives you. From Paul Graham's article -
Indeed, these statistics about Cobol or Java being the most popular language can be misleading. What we ought to look at, if we want to know what tools are best, is what hackers choose when they can choose freely-- that is, in projects of their own. When you ask that question, you find that open source operating systems already have a dominant market share, and the number one language is probably Perl.
It's those who love perl and this site's venerable engine which make this site so great in the loving beholder's eye. Perl is special.
...seen any python monks out there? ;-)