PP5.1 has a new 'Image Protection' system in place which may help you, very featured and powerfull, you could try reading this article on how to stop a search engine from indexing your site, could be just the ticket for you.
When search engines crawl a site that contains Photopost and Reveiwpost I assume they're indexing text in the various fields. That is ok for the search engines to do - it's the indexing of the photos that I'd like to stop.
More importantly I want to stop people using these images, being served off of my server, on their own websites and blogs. How can I put a stop to that?