Not sure which iPhone/iPod Touch application to get? Let Apple help you with its list of Top 10 applications, sorted by category. Ten categories are available and you have the choice to toggle displaying between the Top 10 paid and Top 10 free applications.

Apple is currently holding a 1 Billion App Countdown promotion. You can enter to win without making a purchase. Please don’t forget to read the official rules.

As of today, nearly one billion apps have been downloaded around the globe. So we just want to say thanks — a billion. Download an app and you’ll automatically get the chance to win a $10,000 iTunes Gift Card, an iPod touch, a Time Capsule, and a MacBook Pro. Just go to the iTunes Store, browse the App Store, and download your best app yet.