Author: Aaron Hillegass
Publisher: Addison-Wesley Professional; 3 edition (May 15, 2008)
List Price: $49.99, Your Amazon.com Price: $31.49
ISBN-10: 0321503619
ISBN-13: 978-0321503619
Average rating: 4 1/2 stars
Amazon Sales Rank: #1,009 in Books

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Summary (from publisher's website)
The best-selling introduction to Cocoa, once again updated to cover the latest Mac programming technologies, and still enthusiastically recommended by experienced Mac OS X developers.

Since releasing developers of the gag order via their IPhone developer NDA, Apple apparently has added forums to discuss IPhone development.

https://devforums.apple.com

The forums are only available to paid IPhone developers

I didn't know about this event until seeing the site making the technology page on Digg, I found the keynote very informative and think anyone else interested in IPhone game development should also watch it.

Apple press release

To sum it up from a developer's perspective...
"Quarterly iPhone units sold were 6,892,000 compared to 1,119,000 in the year-ago-quarter. "

Almost 7 million IPhones sold in one quarter ready for you to target your app.

Another gem found at Google Code:

iGLU is an implementation of the OpenGL Utility Library (GLU) for iPhone OS.

iGLU does not include GLU features that depend on OpenGL functionality missing in OpenGL ES 1.1.

Available features:

* Matrix manipulation
* Polygon tessellation

Missing features:

* Mipmapping
* Quadrics
* NURBS