Apparently many iPad cases and stands can hold your iPad anywhere, also including kitchen. However, it seems only FridgePad can keep the iPad on the fridge door just like a fridge magnet.
FridgePad is an unique pad made from aluminum and plastics, finished anodized silver, and designed for the innovative Apple iPad. FridgePad is integrated in a large powerful magnet that allows you to easily mount the iPad on any metallic surface such as the most common fridge door.
If you want to use your iPad, turn it into a giant fridge magnet using FridgePad. The pad for iPad is price at $75 USD. It will be available at Woodford design from the autumn.
By the way, ElementCASE also presented their kitchen solution for iPad: a simple metallic T-shaped stand.
FridgePad Turns Your iPad into Giant Fridge Magnet Source