If you have an iPhone and have downloaded apps and games to it, there's a good chance you've got Tap Tap Revenge on your phone because its the most popular app right now, free or paid. If you don't have it, here's a link to it at the iTunes store so you can download it and try it out.

Tap Tap Revenge is like Dance Dance Revolution meets Guitar Hero for the iPhone. You hear music and you tap along. And best of all, you can play your friends in two player mode. Here are a couple reviews of the game if you want to read more about it.

This post is not about the game, it's about what we can learn from its success. I posted a bunch of questions about the iPhone platform a week ago and this is my first follow up post. I hope and expect there will be more.

One of the questions I asked about iPhone platform is whether there would be a "first mover" advantage like the one Slide, RockYou, and iLike got on the Facebook platform. At least initially, it appears that is not the case.

Tap Tap Revenge was not available the first two days that the iPhone app store was open because of some technical problems and so we saw the rise of Super Monkey Ball, Remote, Pandora, etc.

But once Tapulous, the developer of Tap Tap Revenge, was able to work through the technical issues with Apple and get the app released in the store, it started its rise to the top. It was unavailable on Thursday and Friday, it was released on Saturday, and it was the most popular game by Sunday night, and became the most popular app by the middle of the week. At this time, it appears that Tap Tap Revenge has the most heat of any iPhone app out there.

So being first out of the box was not as important as I thought it might be. That said, Tap Tap Revenge did get into the app store in the first week and that may be all one needs to get the "first mover advantage."

But I think there is something even more important to notice about Tap Tap's success. When Seth Godin released his first marketing book, Permission Marketing, he gave away the first four chapters for free via pdf to over 150,000 people. It generated a lot of buzz about the book and was a big factor in the book's success when it eventually became available in hardback. So when he followed up with Unleashing The Ideavirus, he went one step further. He gave away the entire book for free in pdf (it still is available free). Seth says that over 2mm copies were given away. And yet when the book was published in hardback it went to #5 on Amazon. It was a demonstration of the very tactics Seth was evangelizing in the Ideavirus book. Seth asserted that by giving away your product early to your greatest fans who will do more work and put up with a less than optimal experience, you prime the pump for the mass market. That's because your early fans will spread the ideavirus and market the book for you.

Tapulous did the same thing with Tap Tap Revenge. The game was first made available for the iPhone at the start of this year. But the only people who could play it were people with phones that were jailbroken. So it's audience was small, but fanatical.