An extension of Matthew Hough's Header Image Rotator v2.0 to allow embedding of Flash (*.swf) files in the header. See website for usage and examples
Unzip into /wp-content/plugins/ folder.
Create a directory in your /wp-content/ folder named "header-images".
Add some images and/or SWF files into the "header-images" folder.
Activate the plugin from the admin panel.
Go to 'Options' in the admin panel, and then 'Flash Header Rotator' to configure.