If you're one of the lucky ones who were able to snag a new iPhone 4S or upgraded your existing Apple device to iOS 5, then you're probably wondering how fast you can fill up all those gigabytes of memory with apps. The Apple App Store has half a million apps available, so narrowing it down to what you really need can be a forbidding task. Here's a list of top 10 essential apps for your iPhone 4s or your iOS 5 device:

Siri. This one comes with the updated iOS 5 and is specific to the iPhone 4s. This virtual assistant can help you organize your iPhone and your life with its dulcet tones.

Find My Friends. Find My Friends app now makes it easier to see (also stalk) your friends in real time. The app keeps track of your friends wherever they are and in continuous real time. Yes, this app can raise the creep factor by 10 but in harmless hands it is useful in finding out if your friends really are on their way or they're still stuck in traffic. Find My Friends is now available for download in the App store but is restricted to devices running on the iOS 5.

Newsstand. Not really an iPhone 4s specific app like Siri, this handy app will lump in all your subscriptions in one app for easy retrieval. Plus it comes in a cool new design that looks like a real news stand. The app comes preloaded with the iOS 5.

iTunes Movie Trailer. This free app gives you access to Apple's gigantic library of movie trailers. The new version will also let you reserve and buy tickets, find theaters and tell you about new film releases. It's a very useful app for movie-lovers. The app is available for free download from the App store.

Facebook. New updated Facebook app that is supposed to be better integrated for iPhone users. Previous versions have caught flak from iPhone users because it caused crashes; the new version is supposed to have fixed it.

Words with Friends. This app is now both a game and a social network. Chat capability and social media tie-ins have made it easier to make friends with fellow logophiles. Download it at the app store for $0.99.

Foursquare. Sort of like Find My Friends, but for free. This app has a new Radar feature for the iOS 5 that lets you find out if you have friends in the vicinity or it can notify you if you need to leave the place if you're hiding from that person. Available for free in the App store.

Scribblenauts. Scribblenauts Remix has about 50 levels of puzzle-solving fun. It costs about $5 at the App store but is worth it.

Airport Utility. A very useful app that lets you control your wireless network through your iPhone. You can now have total control over your network with Airport Utility and it comes with a nice visualization of your entire network. Airport Utility can be downloaded for free from the App store.

Grand Theft Auto 3. Gamers should have a great time with the iPhone 4S. Boasting the same chip that powers the iPad 2, there are more choices for gamers in the iPhone 4S. One of these is the new iPhone version of Rockstar's best selling title, Grand Theft Auto 3. GTA 3 is set for release on Oct. 22 and is only available for iPad 2 and iPhone 4s. Check the App store for pricing and download.