According to Endgadget Mobile, iPhone 3.1 beta lets iPhone 3GS users save a copy of video clips taken with the device so that portions aren't lost when editing video. iPhone 3.1 also includes a video API that lets third party applications access and edit iPhone videos.

MMS messaging is enabled in iPhone 3.1 beta, but still doesn't work because AT&T hasn't added support for it. After being showered with disdain last month in the wake of Apple's Worldwide Developer Conference, AT&T announced plans to support MMS at some point in the future, and to offer it at no extra charge to customers with a text messaging plan.

Other new features in iPhone 3.1 include Bluetooth support for Voice Control, a new iPhone 3GS feature that lets users speak commands and also identifies the artists and titles of songs; device vibration when moving iPhone icons; and improved graphics support.

It's unclear whether iPhone 3.1 beta includes a fix for the overheating problems that some iPhone 3GS users have reported. Apple hasn't indicated a release date for the final version of iPhone 3.1.

iPhone SDK 3.1 beta and iPhone OS 3.1 beta are now available through Apple's iPhone Dev Center. Apple says the betas are for development and testing only and should be installed on devices dedicated to iPhone OS 3.1 beta software development.

Launched last month, iPhone OS 3.0 added long awaited features such as cut, copy, and paste, push notifications, peer-to-peer connectivity, and in-application financial transactions.