These are some plugins that you should really consider for your site. They are either very powerful, or very cool, or both!
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Curation Fire

Best manual content curator we have found so far. Search from the post editing page for content from Google, Youtube, Flickr, Twitter, Wikipedia, SlideShare, and more. Preview and edit. Automatically credit and link.

Now priced from: $19.95

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FOntastic

When WP Fontastic is installed in your blog, you can easily include a variety of “hand drawn” or artistic fonts in various colors. Let your creative juices flow.

Now priced from: $37

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News Flash Bar

Cool scrolling bar with text, icons, social links. One of the nicest attention getters yet. Fully customizable. Assign diff bars to each page or post. Optional close button. Optional display frequency.

Now priced from: $20

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Samson

Automated backlinking

Now priced from: $47

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Sorethumb

There are lots of interesting wordpress plugins that come out. Some are add new functions, some link other programs to wordpress, and some just do cool stuff. SoreThumb just does cool stuff!

Now priced from: $5

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VideoAffiliatePro

Create Killer Video Review Pagein a few clicks create a high converting video page

Now priced from: $9

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WhatsMyRank

Track search engine ranking of all your sites for your keywords

Now priced from: $16.13

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WP sales magix

Finally Give Your Visitors The VIP Treatment They Deserve By Giving Them Content Personalized for Them

Now priced from: $17

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WP Total Contact

Directly link social media channels, contact information, google maps, skype and phone details all in one place.

Now priced from: $18

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WPDecorator

This is one of our Featured plugin because of its powerful and unique way of adding images anywhere on the page or post.

Now priced from: $19.70

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WPgenerator

Unblockable, beautiful lightbox popup boxes. Increase opt-in rate by 300% or more with just this tool.

Now priced from: $77

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