In my daily scanning through all the newly released apps and my usual grumbling to myself at how many SupaFan/TravelTo/Etc. apps I have to scroll past every day and thinking how nice it would be if they'd just make ONE app and then use in-app purchases to sell additional content instead of clogging up the app store, I got to thinking that so far I've not seen any apps that actually USE the much-touted 'in-app purchasing'. Have there actually been any that anyone knows about and I've just somehow missed seeing? And if not, is there a reason nobody has started using it yet? I'm kind of surprised, for example, that Amazon hasn't incorporated it into the Kindle app yet since it would be a cinch to think they'd want to make it easier for people to buy books through it instead of having to go buy them through the web page like you do now...