We came across a new service today that promises to be very useful for anyone building and launching an app on the app store, whether you go it alone or use the Appifier platform.
Take a look at http://appcod.es/, the inexpensive service allows you to determine what keywords competing apps are using to get placement in search listings and then improve your own, so that you can organically move up the charts on the App Store.
The New Appifier Blog 