On my 1G ipod touch, whenever i go to the app store, it is all in German (not that that matters to me), but when i try to buy anything, it tells me to log in, then when it starts to download, it says "Your account is only valid for purchases in the US iTunes Store." I also get it on the mobile iTunes. Even when i log in, it still is in the German iTunes/App Store. I have no idea why this happened, and have never heard of it happening before. Any ideas? Thanks
On the main page of the iTunes Store on your computer, scroll to the bottom and set the pop-up menu to the US store. Then sync your iPod Touch. The store/account association for the device is set based on the last sync.