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Jesse Ruderman's Blogidate bookmarklets cycle through all of the textareas on the current page and submit their contents for validation. I suggested an alternative approach, and to my great delight has has followed it up with the essential Blogidate XML well-formedness. One click, and each textarea on the page will be checked to see if it contains valid XHTML. If it does, the background goes green - if not, it goes red. Hopefully I'll never post another invalid entry (my previous solution broke when I switched to application/xml+xhtml).