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For my blog aggregator display, I use RegEx to strip HTML tags out of the text from blogs before they are displayed to avoid scripting.
I also have a http referer display where I show which pages linked to my blog. I find that very often the referer was a link to a p0rn site or some other mass marketing site. I maintain a list of these unwanted referers (which actually have no link or other association to my blog), and then filter the referers through the list before displaying them.
Steven Erat
TalkingTree.com
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