Flash is a popular animation programme for fast loading 'movies'. Modern browsers have the plug-in pre-installed allowing you to view flash presentations like the ad above.

See an example of a presentation here

So long as it's used properly, Flash can enhance your site and is excellent for illustrating presentations. You can also open a movie in full-screen window.

See a full screen movie here

Advanced flash 'page flip book', with sound effects.
The pages can be turned by clicking or dragging on any corner. Featuring a rip-out page and transparency: Click