I'm going to admit to not having used this yet. But having used a lot other solutions (most recently pear Safe_HTML with additional pre/post-processing), this is a breath of fresh air: HTML Purifier
Matt: March 2008 Archives

Any programmer has done this one a thousand times. But this one is more fun than I remember this being before.
So, I've upgraded to Moveable Type 4.1, and I'm forcing commenters to use on the of the web login services (typekey, oid, etc). If that doesn't cut down on the spammers, then it's time to drop the hammer and put in an anti-spam plugin. But at least now that I am upgraded, getting such a plugin will be easier.

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