Adobe announced today the release of the Beta 4 version of Lightroom, available for public download.
Adobe Photoshop Lightroom beta 4.0 offers improved digital photography workflow tools, including a precision white balance selection option and a more streamlined and elegant user interface experience with customizable controls. An intuitive new tone curve adjustment feature provides powerful image correction capabilities, allowing users to visually obtain excellent midtone, shadow and highlight adjustments.
The first beta of Lightroom was released by Adobe in January 2006 and is poised as a direct competitor to Apple's Aperture.
Meanwhile, Apple is rumored to release an update to Aperture at their September 25th Media Event today at 10:30 EST. The possibility of Mac portable updates has also been raised, though the evidence has not been overwhelming. The latest report simply places the updates before the holiday season. Ongoing discussion about potential MacBook upgrades should be directed to this ongoing thread.