The oh-so-smart Steve Champeon on

The oh-so-smart Steve Champeon on XSS, Trust, and Barney, a discussion of misguided trust on the Web (like when you let people post HTML to your site through forms). And just to prove his point, he then hacked the last page of his article, resulting in a little Barney with your Monkey.

Of course, for me, a link to kottke.org on Webmonkey is a lot more fun.