I'm just passing this on, as I didn't do it, I just found it.
Over here is a pretty slick way to unescape HTML. I ran into the need for this when I was working on some inline-editing code. I wanted to reset the contents of the textarea to the contents of a pre tag. The contents of the tag are of course escaped, but I want them to be proper HTML in the textarea. Using this trick allowed me unescape the contents easily and stuff it back in the textarea.