Behind the Scenes Video: Dynamic Design Update Control
As first presented back in April, Magento’s next release will feature dynamic design update control. This feature will allow complete control of the interface (layout, themes) on a per product and per category level with the ability to schedule changes by date.
In this video, we apply different themes to categories to show the design flexibility on a per-category level. The same process can be applied on a per product level (not shown in the video).

1Scott from Northwest Ohio|posted January 27 2008
As someone else had suggested, this might be good for A/B testing as well, assuming you can setup analytics that can appropriately report on both versions independently of each other.
2BryGuy |posted March 26 2008
Unfortunately we are not able to hear any audio. Is it me or are the videos produced without audio?
3RoyRubin from Los Angeles, CA|posted March 26 2008
@BryGuy - Audio is not available in these videos.