Today I came across Cary and Michael Huang's The Scale of the Universe animation (2010).
It's quite impressive:
Move the horizontal slider button (or click the left/right arrow keys) to zoom in and out across the scale. And here's a tip: be sure to click the down arrow key to improve the quality of the image.
In a similar vein, watch Cosmic Journeys: Cosmic Energy Powers of 10 '¦
The two previous journeys across the universe not enough for you? Then why not also watch From Quarks to Outer Space
Here's the same as a Java animation.
It would be remiss of me not to mention the groundbreaking classic Powers of Ten documentary.
This was produced way back in 1968, written and directed by Ray and Charles Eames.