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I offer users the opportunity to email and embed images from my website.  (See this page http://www.andertoons.com/cartoon/6246/ and look under the large image for "Email to a Friend" and "Get Embed HTML" links.)

But I'm seeing the ensuing pop-up pages (Ex: http://www.andertoons.com/embed/5231/?KeepThis=true&TB_iframe=true&height=370&width=700&modal=true and http://www.andertoons.com/email/6246/?KeepThis=true&TB_iframe=true&height=432&width=700&modal=true) showing up in Google.

Even worse, I think they're seen as duplicate content.

How should I deal with this?

I have a website that sells images. When you search you're given a page like this:

http://www.andertoons.com/search-cartoons/santa/

I also give users the option to resort results by date, views and rating like this:

http://www.andertoons.com/search-cartoons/santa/byrating/

I've seen in SEOmoz that Google might see these as duplicate content, but it's a feature I think is useful. How should I address this?