Apple has just released iTunes 9.2 on its website, bringing with it official support for iOS 4 and iBooks 1.1.

A beta build of iTunes 9.2 has been available to registered developers since last week, but the final version is now out and will likely be more stable. In addition to supporting iOS 4 devices, iTunes 9.2 also improves the way that eBooks and a iPhone applications are organized.

Under the hood, most of the cosmetic changes to the latest iTunes won’t appear until iOS 4 is released on June 21. With iOS 4, digital books from the iBooks application will now support iPod touch and iPhone devices, as well as the iPad.

The next version of iBooks will also handle native PDF support, which should make it easier for users with lots of PDF-formatted eBooks to view their content in the iBooks application. These books can be stored alongside ePub titles in iTunes. In iTunes 9.2, you can drag PDF books or documents into the Books section of iTunes.

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Another feature that won’t be usable until iOS 4 is released is application folder support. Right now, the iPhone is limited to displaying 11 pages of application icons. Beginning with iOS 4, you can create folders or “stacks” of applications grouped any way you see fit. By dragging applications on top of one another, either in iTunes or on the iPhone, you can create these stacks. This makes managing related groups of apps much easier.

iTunes 9.2 is available either through Software Update from within iTunes for by visitingapple.com/iTunes/download.

What do you think of iTunes 9.2? Which of these upgrades are most relevant to you?