Multitasking - Done the Right Way on iOS 4

Now, i will tell you the excellence and specifications of iOS 4 :

Switch between apps quickly.

The multitasking user interface allows you to quickly switch between apps. Just double-click the Home button to reveal your recently used apps. Scroll right to see more apps, then tap one to reopen it. No need to wait for the app to reload.

And pick up right where you left off

Apps can remember where you left off. So when you return to the app, you can jump right back into playing your game, reading the news, finding a restaurant, or whatever you were doing.

Listen to audio in the background.

Now you can listen to audio from compatible third-party apps while checking email, surfing the web, playing games, and performing other tasks. So when you want to follow a ball game or listen to music from Pandora, your productivity never skips a beat.

Get VoIP calls while using other apps.

Third-party apps such as Skype let you make voice calls over the Internet. Multitasking in iPhone 4 makes it possible to receive these Skype or VoIP calls while other apps are running, even when your iPhone is locked. And during a call, you can keep the conversation going while you switch to another task, such as checking a movie listing or reading an email.

Keep GPS apps running.

Apps that use GPS can continue to run in the background. Not only do they constantly update your position, they can also give you spoken turn-by-turn directions even as you listen to music (the music volume lowers while the directions are spoken). It’s perfect for social networking apps, too. Now you and your friends can find each other even when you’re not actively using the app.

And the specifications :

1. 512 MB of RAM and 16/32 MB storage
2. GPRS Class 10 (4+1/3+2 slots), 32 - 48 kbps
3. EDGE Class 10, 236.8 kbps
4. 3G HSDPA, 7.2 Mbps; HSUPA, 5.76 Mbps
5. WiFi 802.11 b/g/n, Wi-Fi hotspot
6. Bluetooth v2.1 with A2DP
7. Camera 5 MP, LED flash
8. Touch focus, geo-tagging
9. Video 720p@30fps, LED video light
10. Battery : Standby up to 300 h (2G/3G), Talktime up to 14 h (3G), 7 h (2G), Music Play up to 40 h

And more specifications you can click this link