How to detect the active iTunes store on the iPhone/iPod Touch/iPad?

I'd like to be able to determine which store the user connects to from inside my app, so that I can direct them to some appropriate content for their device AND store. Does anyone know how to get this information?

Basically, if the user is in the UK, and connects to the UK store, I want my function/method to return GB, if in Korea, I want KR, Australia = AU etc. Any help would be appreciated.

The approach of getting the country code of the user's locale will work ... but only if the user's iTunes store is the same as their locale. This won't always be the case.

If you create an in-app purchase item, you can use Apple's StoreKit APIs to find out the user's actual iTunes country even if it's different from their device locale. Here's some code that worked for me:

- (void) requestProductData
{
    SKProductsRequest *request= [[SKProductsRequest alloc] initWithProductIdentifiers:
                                 [NSSet setWithObject: PRODUCT_ID]];
    request.delegate = self;
    [request start];
}

- (void) productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response
{
    NSArray *myProducts = response.products;
    for (SKProduct* product in myProducts) {
        NSLocale* storeLocale = product.priceLocale;
        storeCountry = (NSString*)CFLocaleGetValue((CFLocaleRef)storeLocale, kCFLocaleCountryCode);
        NSLog(@"Store Country = %@", storeCountry);
    }

    [request release];

    // If product request didn't work, fallback to user's device locale
    if (storeCountry == nil) {
        CFLocaleRef userLocaleRef = CFLocaleCopyCurrent();
        storeCountry = (NSString*)CFLocaleGetValue(userLocaleRef, kCFLocaleCountryCode);
    }

    // Now we're ready to start creating URLs for the itunes store
    [super start];
}