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Some off the top of my head ideas:

Social plugin to encourage social sharing
Related posts plugin to place at the bottom of your articles
Outbrain plugin to show your top posts
Where did they...

I use woocommerce on some of my clients sites, but I don't really know if you can do something to improve seo with it besides common sense stuff. (descriptive product titles plus long descriptions)
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Facebook comments - great for promoting the blog. Every time someone leaves a comment it shows on their timeline. If your titles are catchy this strategy alone can bring some nice traffic. (provided...

I didn't know there can be a separate site map for images. I now a separate site map for videos exists, but image XML is a great idea.. <went to install a new plugin> thanks for idea!

I use Wordpress on all of my sites and I love it. It has some security issues but here are ways to make a Wordpress installation more secure, so with a bit of prevention the sites are safe

Thank you for a great list of plugins! Do you notice the wp slowing down when all of them are active?