Add slick looking Amazon Search widgets to your blog posts in a brain-dead simple way! 
Just say <code>[search]</code> to add a Search widget anywhere on your blog.
Amazon Widgets are small Flash-based mini-applications that bring Amazon’s rich features right to your website. The Amazon Search widget is a really useful widget that lets your users search from Amazon products right from your blog. You can even earn money by specifying your Amazon Associates ID.
There are many ways to create a Search widget. Here are some:
<ol>
<li>
<code>[search]</code> 
This creates a 160px widget widget with 1 column and 5 rows.
</li>
<li>
<code>[search keywords="Nikon DSLR" category="Photo"]</code> 
This search widget lets you search through Amazon’s ‘Camera & Photography’ catalog with results for “Nikon DSLR” displayed by default.
</li>
<li>
<code>[search width="500" columns="2" rows="3"]</code> 
This creates a 500 pixel wide widget with results spanning 2 columns and 3 rows.
</li>
<li>
<code>[search design="1" color_theme="Pink"]</code> 
This creates a pink themed widget. Make sure to choose a design and color theme that makes the widget blend in with the rest of your page design. 
You can select from a range of designs and color themes. These are valid design/color_theme combinations: 
Design: ColorTheme 
1: Blues, Pistachio, RedGrey, Pink, Pumpkin 
2:Default, Blue, Grey, Orange, Pink, White 
3:Cinnamon, Peppermint, Spearmint 
4:Onyx, Cobalt, Ruby 
5:BrushedSteel, BrushedNickel, BrushedCopper 
</li>
<li>
<code>[search show_rating="False" show_price="False"]</code> 
This creates a search widget where the star ratings and price for each product are hidden. So you only see the Product title and sub-title for each result.
</li>
<li>
<code>[Search tag="ohmyki-20" show_price="false" show_rating="false" keywords="HDTV"]</code> 
This creates a Search widget results for the keyword “HDTV”. The search results will not have price or ratings information since we’ve set those to “False”. Also, since the ‘tag’ parameter is specified, you will earn an Affiliate referral fee for any sales made through this widget. IMPORTANT: One in 5 impressions of this widget will be tagged with the plugin creator’s affiliate ID (‘wp-search-20’).
</li>
</ol>
You can customize a lot more in your Search widget widget. Check out the FAQ section for more details.

WP-Amazon-Search widget

Add slick looking Amazon Search widgets to your blog posts in a brain-dead simple way! Just say [search] to add a Search widget anywhere on your blog.

MaximeB

Amazify is a very simple plugin that will edit any Amazon link in all posts to add your affiliate tag. If there is already an affiliate tag in the link, the plugin will replace it with yours.
In addition you can tell him to automatically add a nofollow attribute and/or a target=”_blank”.
You don’t need to check anymore every single Amazon links you or other writers added in your posts !
New feature : catch all Amazon links and redirect them all to a single URL (like a links proxy for example).
Features :
<ul>
<li>Check all Amazon links in a post and add your tag (&tag=yourtag-21) or change existing tag into yours.</li>
<li>Add a nofollow rel attribute if you want so (Options)</li>
<li>Add a target=”_blank” attribute if you want so (Options)</li>
</ul>

Amazon Affiliate Tag

Automatically edit every Amazon link in your posts to add your Amazon affiliate tag. Safest way to be sure to earn commissions from Amazon sales !

WP-Amazon-Search widget vs Amazon Affiliate Tag