I don't get what a dynamic URL is?
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I have a whole bunch of them and I have no idea how I created them. I just make titles, that's it. Nothin' fancy.
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A dynamic URL usually has something called a query string. In your URL, it's everything after the ? and is typically used to pass data to a programming language.
Some sites use mod_rewrite to change them to look less program related
It's important to note that ANY change in the query string will make Google see that page as distinct, even if there's nothing else different. If you have an issue with this type of duplication you should use canonical to narrow down your pages to just those with distinct content.
If you're adding titles (like to a Wordpress blog) it's possible that you're creating pages and your CMS program makes URLs based on titles
domain.com/blog/the-best-blog-topic-ever
Is that what you're referring to?
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I don't know how they're creating themselves? It's like 1 post has several of them?!
Cindy and Jeff’s Wonderful White, Yellow and Silver Beach Wedding
Slideshow « Cindy and Jeff’s Wonderful White, Yellow and Silver Beach Wedding
Cindy and Jeff’s Wonderful White, Yellow and Silver Beach Wedding
(etc etc.)
And btw... I don't intentionally have a slideshow set up, but I do have Next Gen on my site?
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Hi
Nice photos by the way

How do you arrive at the pages with the dynamic URLs? Try signing out of WordPress and viewing the site while not logged in.
You have the canonical tag in place, so honestly, there is no duplicate content issue. I'm just curious how you discovered the different URLs? That's not usually something a normal user browsing the site will see, at least not what I've seen with WordPress anyway.
-Dan
EDIT: It just occurred to me, you probably found these URLs in the SEOmoz campaign tools?