This video (well, the first fifty seconds says it all) illustrates Neal Adams's theory that the Earth is a growing entity. Neal's not a big fan of Pangea (a single mass containing all the contemporary contintents just crammed together in a planet that's mostly ocean). This, for me, is a revelation - it's convincing as it uses evidence that's scientifically generated by geologists. Neal Adams' theories have been featured in the New York Times.
For me, there are two 'valid' mechanisms that could support a Growing Earth:
1) any solar system is primarily a gravity-driven mechanism that forms 'inter-dimensional leaks' where matter pours out in the form of a central star and orbiting planets of varying sizes. This gravity-driven mechanism dictates that all components of the solar system should be growing over time.
2) Earth's atmosphere is shrinking - in the time of the Pangeaic dinosaurs the atmosphere was MUCH bigger, higher, richer in the elements that fuelled 'plate techtonics'(sic). This implies that over time Earth's atmosphere will be eaten up and the Earth will stop growing, sorta like where Mars is now.
I'm also a BIG FAN of growing earth not merely BECAUSE of the cross-continent aspect of fossil finds but because LOGICALLY a smaller planet (i.e. less gravity) will support much larger land animals, like dinosaurs. I'm not totally convinced the largest dinosaurs can support their own weight and move around as effective predator/prey in our contemporary gravity field.