Getting started: Let's start learning how to create iphone apps!

An Absolute Beginner's Guide to iPhone Development >> Link

iPhone SDK: Interface Builder Basic Training >> Link

Creating Your First iPhone Application with Interface Builder  >> Link

How To Create Your First iPhone Application >> Link

Mobile development 101: What you need to know

These are the 8 key points as advised by Info-world website (worth considering):

Mobile app dev lesson 1: Focus on user experience 
Mobile app dev lesson 2: Deal up front with memory and bandwidth constraints
Mobile app dev lesson 3: Choose carefully between native and Web development
Mobile app dev lesson 4: Think about how to take advantage of location
Mobile app dev lesson 5: Rely on server-side data synchronization
 Mobile app dev lesson 6: Design and code for touch interfaces 
Mobile app dev lesson 7: Don't get too dependent on hardware performance
Mobile app dev lesson 8: Expect users to make mistakes

To read the complete article, click on this link: 
Taken from Info-World.com

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How to use iphone to surf the internet?

( taken from Apple website)
iPhone requirements
Internet tethering requires one of the following iPhone models:

• iPhone 3G
• iPhone 3GS
• iPhone 4

Note: Tethering is not available on the original iPhone.

Apple recommends using the latest version of iOS. AT&T tethering requires iOS 4 or later.

 
Computer requirements

For Internet tethering using a USB port, you need
A Mac OS X computer running Mac OS X 10.5.8 or later or a computer running Windows XP Service Pack 3 or later, Windows Vista, or Windows 7, and a USB 2.0 port.
iTunes 9.2 or later downloaded and installed on your computer.
Note: if you downloaded iTunes 9.2 using a web browser, you may still need to install it. See this article if you experience an issue installing iTunes.
An Apple iPhone USB cable (included with iPhone 3G and iPhone 3GS).

For Internet tethering using a Bluetooth port, you need:
A computer running Mac OS X 10.4.11 or later (Mac OS X 10.5.8 recommended) with Bluetooth 2.0 or a computer running Windows XP Service Pack 3 or later, Windows Vista, or Windows 7 with Bluetooth 2.0.
To turn on Bluetooth on your iPhone and your computer.
iPhone must be paired to your computer.

Additional Information

Tap Settings > General > Network> Internet Tethering to confirm that your carrier supports Internet tethering. If you don't see this option, and your carrier supports Internet tethering, connect iPhone to iTunes to install a carrier settings update in iTunes. If you don't see a carrier settings update, your carrier may not support Internet tethering. Contact your carrier for additional information.

Testing 123

All set.. ready to go.. 123!