In case you want to share the 3G (or EDGE) data connection of your iPhone with your notebook, you should hurry up and grab Nullriver's NetShare application. Use this link to purchase it from Apple's App Store. You do have to use the direct link as the application does not show up in App Store and is not showing up in search results!
NetShare has been posted to the App Store last night but Apple pulled it down right away.
Here is the App Store description:
Please note that some carriers do not allow you to share the iPhone's data connection with anything else than the iPhone (however, they will not find out if you use NetShare) but you might want to be warned that you're potentially going to break your contract by using NetShare. (Obviously, 24100.net does not encourage you to do so in any way!)