Click the images to see these sliding sites in action…
Click an arrow on Netflix’ New Releases page [membership required] and the site slides in a new slew of movies.
Beanstalk is a hosted Subversion system that integrates with Basecamp and Campfire. The home page fits in a complete tour by sliding in information horizontally. Click a link and a new screenshot and caption slide in.
At Apple’s MacBook Air intro, you can click a thumbnail image and a new full size image slides in from the right.