As you may have heard, Apple released an update to the iPhone OS beta to registered developers last night. iPhone OS 3.1 already appears to have a handful of fixes that should please some users, and there are surely more hidden beneath the surface.

According to numerous sources, many items got some love in this beta, including Voice Control now working over Bluetooth (for iPhone 3GS users, that is). The AT&T profile has been updated to 4.2 (enabling MMS to work), the iPhone now vibrates when moving icons around, third-party apps now having APIs to access and edit videos, and the baseband firmware is now version 5.08.01. Additionally, editing video no longer saves over the original by default, allowing you to save a copy and preserve the original for transferring later. Finally, several improvements have been made to OpenGL and Quartz.

As noted by the quickpwn developers, users of the ultrasn0w software unlock should be extra cautious of updating to the 3.1 beta (as in, don't do it at all) unless they like turning their phones into shiny paperweights. This likely doesn't apply to most of you reading this, but we know a number of you are using your US iPhones on T-Mobile, so keep an ear out for when you can update after 3.1 becomes available to the public.