We’ve looked at simple external implementations, such as loading your photos up to Google Picasa and putting a link to an album on your site. The great thing about this is the easy upkeep. When you add photos to your Picasa Album, you don’t have to change your code.
Make sure you check the [Scott Page]. Look for the Slideshows Link. He has working examples and implementation information.
We’ve also discussed more code-level implementations, such as Slideshow2, Tiny Slideshow, and Web Album Generator. These are on Scott’s page.