National Geographic currently has a movie playing in IMAX theaters called Sea Monsters, A Prehistoric Adventure. In conjunction, they have the Sea Monsters Interactive Timeline online. Click on a time period, then on different areas of the world map to see prehistoric sea monsters, some with 3D views. Link -via the Presurfer
The format of this site is very much like that of a project my pen-pal Ewa (a palaeontologist; sadly, she died on 1 February during treatment for leukemia) and I had in mind: an interactive virtual globe/timeline. Go to any part of the timeline you wish, and click on any location to learn about the topography, flora & fauna, whatever. Plate tectonics, volcanic activity, meteor strikes, etc. would be included. This would be a rather massive undertaking, and would be best supported online; but it should prove to be a useful teaching and research tool. It would clearly demonstrate, in 4-D, what we know about the Earth's story --- and how much we have yet to learn.