[cellarius]

I'm not really sure what you mean, I'll try an answer anyway

Originally Posted by htscpl

Hi, sounds great, so the plug-in is only active for the photopost urls within my forums.

No, this plugin is not active in the forums at all. It is only active on showphoto.php in your Photopost gallery. There it inserts the tags inside the page header. You won't see any difference at all when looking at the page in your browser, it's only in the page source. It's for the search engine spiders.

I have links from all members profiles as well as their posts to their photopost pictures..??

That's of no interest for this mod, and this mod will not affect them. It only tells the search engines that there is one page [the canonical one], that can be addressed via different URLS. So the search engine knows that it is not duplicate content and won't penalize you.

You may want to read the explanation on Google Blog I linked to in the first post.