My experience with okonomiyaki is that it is more of a pancake/omelet than a pizza. I first had it in a little neighborhood restaurant in Hiroshima, and have not had the Osaka style. I think it is better in that very substantial omelet-like form than it would be as a thin little pizza-like thing.
http://en.wikipedia.org/wiki/Okonomiyaki
There are plenty of recipes for it online. Re restaurant versions---they seem to vary widely in quality. It's one of my plans to find and try all the okonomiyakis in Seattle.
"My predominant feeling is one of gratitude. I have loved and been loved;I have been given much and I have given something in return...Above all, I have been a sentient being, a thinking animal, on this beautiful planet, and that in itself has been an enormous privilege and an adventure." O. Sacks