This week Varien released the Magento Mobile, a mobile e-commerce platform.
It is still in limited release, meaning you need to ask Varien if you can buy it from them. However, it would be interesting to see how this product might integrate with existing, bespoke online stores. From what I have read so far the guys at Magento will manage iPhone & IPad apps within the Apple Store.
If you want to read a little more check out the launch page: http://www.magentocommerce.com/product/mobile
Here's a quick homemade video: