Download iPhone OS 3.0 Beta SDK Via iPhone Dev Center.
If you are looking for downloading the iphone OS 3.0 Beta version you can download it VIA iPhone Dev center. All you have to do is to join the iPhone developer program. When you join the iPhone Developer Program, you will receive access to the new iPhone SDK and iPhone OS 3.0 beta – so you can prepare your applications for the next generation of iPhone OS. Standard Program costs you $99 while Enterprise Program costs $299. Highlights of iPhone SDK for iPhone OS 3.0 beta With a rich set of over 1,000 new APIs, iPhone SDK for iPhone OS 3.0 beta provides you with an amazing range of technologies to enhance the functionality of your iPhone and iPod touch applications. New APIs also provide support for applications to communicate with hardware accessories attached to iPhone or iPod touch. If you are already a member you can download iPhone SDK 3.0 Beta HERE. It’s free, but if you want to publish and distribute your programs through the iTunes App Store (the only way to do so) it’ll run you $99 a year. If don’t enrolled yet then enroll yourself with Apple and Join the iPhone Developer Program HERE.
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In App Purchase :
Allow users to purchase content or services from your application using the Store Kit framework. This new framework handles the financial aspects of the transaction, processes payment with the iTunes Store, and provides your application with information about the purchase.
Apple Push Notification service :
The Apple Push Notification service provides a way to alert your users of new information, even when your application isn’t running. Send text notifications, trigger audible alerts, or add a numbered badge to your application icon.
Accessories :
Using the new External Accessory framework, your application can now communicate with “Made for iPod” hardware accessories attached to iPhone or iPod touch through either the 30-pin dock connector or wirelessly using Bluetooth.
Peer to Peer Connectivity :
Add multi-player capabilities to your games using the peer to peer network connectivity and in game voice communication features of Game Kit. This powerful new framework allows any application, not just games, to communicate between devices using Bluetooth-no pairing required.
And lots more 
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