All current versions of Zenphoto "suffer" on the so called "duplicate content" problem, which could leads to penalties in search engines like Google. All linked tags, the archive, RSS feeds... should get a rel="nofollow" attribute within the anchor. You should either think about to modify the related functions (e.g. printAllTagsAs, printTags, printRSSLink...) or the themes. If you think this is not a problem, look for the term "duplicate content" and the possible effects concerning the rating of a website.
Regards,
Steffen
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Regards,
Steffen