Lessons in Web Site Security

I found this series of links on the topic of XSS and other Web site security issues pretty interesting... Programming Is Hard, Let's Go Shopping! from Jeff Atwood, in response to this post, Developers, Using Libraries is not a Sign of Weakness - from Dare Obasanjo as well as this... SgmlReader (and HTML parser)  from Mindtouch, and this...First Line of Defense for Web Applications – Part 4  by Anmol Malhotra As an aside... dasBlog has an html/xhtml parser/verifier which, under the terms of the dasBlog open source license, could be used in other projects. I'm regularly impressed with the guts of dasBlog...some cool stuff in there.