Think Secret:

Another new feature substantially improving both workflow and raw performance is Live Filters, which effectively brings the dynamic editing features of Layer Styles to Filters. The pixel radius of a Gaussian Blur, for example, can be adjusted long after it has been applied with just a single mouse click. Sources report substantial performance improvements to the filters themselves, as well, and have speculated that Photoshop may now be tapping the GPU of the video card to help the CPU crunch filters.

There are lots of other features (e.g. – native code for Intel Macs), but the making filters undoable will be very useful.
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From Aperture Tricks:

As some of you may know, Derrick Story from MacDevCenter.com and I co-presented a class at the 2006 Macworld Conference last week. Derrick’s a very generous guide and has provided a free link to his training notes for the class at his blog, The Digital Story. You can go there to download a free PDF. Take advantage of this free training information. It’s really very valuable and it provides By noemail@noemail.org (The Duke). [Aperture Tricks]

I happen to have both of the new Mac image management programs: Apple’s Aperture and Adobe’s Lightroom beta. My initial reaction is that both are very intriguing and useful programs. Right now Aperture has more functioning features, but Lightroom is more intuitive.
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