Eric Mann

Gives you the option of adding a Javascript-powered fading image gallery as a sidebar widget. The widget pulls its images from previous posts and automatically re-sizes them for display in the appropriate area.

Rotating Image Widget

Create a jQuery-driven rotating image sidebar widget.

This plugin uses JavaScript to create a platform-agnostic rotating banner image for your website. Unlike similar Flash implementations, this feature will work even on Flash-disabled web browsers.
Note that you will need to upload your images separately using WordPress’ built-in image gallery feature.

JS Banner Rotate

Create a JavaScript-driven rotating banner image on your WordPress site.

Rotating Image Widget vs JS Banner Rotate