This plugin provides custom meta box to add Google Adword conversion, ads, custom css and scripts in individual pages/posts.

wpwox

This plugin provides custom meta boxes in default Pages and Posts of wordpress where you can enter any scripts for each respective pages or posts, for example:
<ol>
<li>Google Adwords conversion tracking</li>
<li>Google Adsense ads</li>
<li>Any Javascripts</li>
<li>Page/post specific CSS codes</li>
<li>Normal HTML codes</li>
<li>Unlimited possibilites</li>
</ol>
You will get a meta box under each of page and post. The Meta box will have 4 Text Boxes, in each section you can add codes for:
<ol>
<li>Before Content Field</li>
<li>Below Content Field</li>
<li>Scripts to add in tag</li>
<li>Scripts to add in footer below tag</li>
</ol>
Plugin Documentation: 
http://www.wpwox.com/wp-plugin/custom-script-integration/

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