SlideShare for WordPress by Yoast

It achieves this by copying the WordPress.com embed code.

Installation

Unpack and upload it to the /wp-content/plugins/ directory.
Activate the plugin through the 'Plugins' menu in WordPress.

What is new in this release:

• Namespace all functions and classes.
• Moved development to GitHub.
• Removed unused classes from CSS and unused images from plugin download.

What is new in version 1.8:

• Support oEmbed for SlideShare.
• Use new iframe embed method over object tag.
• Better calculation of height related to width.
• Separation of frontend and backend code for better performance.

Requirements:

• WordPress 2.5 or higher