iPhone OS 4 Coolness

iPhone OS 4 was announced on Thursday, and its got a lot of great new features:

Multitasking

  • You can now multitask between apps. The UI is very well designed and is accessed by double tapping the home button.
  • Audio apps like Pandora can now continue to play in the background.
  • VOIP apps such as Skype can receive calls when you’re doing something else, and you can switch to another app without dropping a call.
  • Apps can now receive notifications when your location changed which are triggered when you change cell towers.
  • Apps can now display local notifications which are like push notifications but are generated locally by the app.

Folders

  • You can now create folders on the home screen which allow you to group apps however you like. This is a great feature which has been needed for a long time!
  • You can put folders in the dock.

Wallpaper

  • You can now change the wallpaper for the home page and the lock screen.

Mail

  • Unified inbox.  Messages from multiple accounts now appear in one inbox.
  • Organize messages by thread.
  • Open attachments.

iAd

  • Developers can easily add ads to their apps and earn 60% of the revenue.
  • Users access interactive ads within apps and can return to the app where they left off.

Other Stuff 

  • iBooks is now available on iPhone