One of the highlights of Apple's iPad announcement was the heart of the device, the custom system-on-a-chip (SoC) now known as the Apple A4. This mysterious chip spawned from Apple's longtime partnership and 2008 acquisition of PA Semi.

The A4 is a power-sipping, high speed 1GHz processor with an integrated graphics processing unit (GPU) that runs Apple's multi-touch iPhone OS like nothing else. According to Steve Jobs, the iPad will play video for 10 hours before its battery is exhausted.

Apple told Google that its Voice app was not welcome in the App Store, to the chagrin of many users of the service. Google did not give up, it went ahead and developed a web app that works on any handset supporting HTML 5.

Now iPhone users can get Google Voice using the web app. Simply browse over to m.google.com/voice in Mobile Safari to access the service on your iPhone.

The predictions that Apple would announce a multiple-carrier model for the US did not come true on Wednesday at the iPad special media event. In fact, Apple made a deal with the carrier to provide data services to iPads, and didn't mention any changes in the exclusive iPhone deal with AT&T.

For its part, AT&T has announced major improvements to the range, speed and strength of its 3G wireless network. The company currently provides service to twice as many smartphone customers as its nearest competitor.

Developers have already started digging into the iPhone OS 3.2 code now that Apple has released the latest SDK in connection with the iPad. There are several hints that increased functionality is on the way in future iterations of the iPhone.

Some of the highlights in the code include ways to accept and decline a video conference, switch a video feed from camera to camera (front and back?), and run a video call in full screen mode or in a window. Could it be that a front-facing camera is on its way to the 4G iPhone for video calling?

We've been covering the iPad for some time now, since the tablet is so closely related to the iPhone. Now that the product is a reality, a brand new resource for everything iPad has just launched. The iPad Guide went live shortly after Steve Jobs announced Apple's highly-anticipated tablet computer this Wednesday.

One highlight of The iPad Guide is a section devoted to frequently asked questions (FAQ) about the tablet, its capabilities, and its accessories. With the initial ship date almost two months away, plenty of details about the iPad are sure to be revealed every day.