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[abatis]

DigiTimes: Apple has previewed its iPhone OS 4 software and released a beta version of the software to iPhone Developer Program members. The new release includes an updated Software Development Kit (SDK) with over 1,500 new Application Programming Interfaces (APIs) and over 100 new features that will be available to iPhone and iPod touch users in summer 2010, the company claimed.

iPhone OS 4's new multitasking offers users a new way to move between apps, and provides developers seven new multitasking services to add multitasking features to their apps. These services include background audio, so apps like Pandora can play music in the background, and VoIP, so VoIP apps can receive a VoIP call even when the iPhone is asleep or the user is running other apps.

iPhone OS 4 delivers mail experience on a mobile phone with its new Unified Inbox, allowing users to see messages from all their email accounts displayed together in a single inbox. Users can switch between inboxes to see messages from any single account. In addition, users can now thread their messages by conversation, making it easier to stay on top of email discussions.

Read More at DigiTimes

[Almen]

well, I think many folks can't wait any more, the iphone OS 4 maybe a good adding for ipad lack multitasking!
you see, that is so sleek and convenient for apps runing and switching, as ipad is seen as a great portable video game device, and good game play platform, easy and great ebook reader, it really need apps running, so lack multitasking is some insufficient for folks enjoy.
aha, luckily, apple never stop innovation.