This is a very simple way to play ad supported games on the iPhone without the annoying ads. Really all you have to do on an iTouch is disable the wifi. On an iPhone you may have to disable your 3G data connection as well.
Step 1: ITouch Settings
Go to your settings menu and click on the WiFi connection button.
Step 2: Turn Off Wifi. Enjoy
Turn off the wifi. Now you can enjoy games like Lemonade Tycoon without ads. You may have to turn off your 3G on the iPhone.
The ads have to be loaded via an active internet connection. Without a connection they will never load. Awesome.