I am using prettyPhoto with WP 2.9.2 and it works fine except when I include a link to a youTube video: it works, but (rather mysteriously) it adds a second " at the end of the rel tag, which throws a W3C validation error (I am using XHTML 1.0 Strict templates). As I said, it works, but I for the life of me cannot get rid of the offending redundant double quotes at the end of the rel tag (which do not appear when displaying images).