Japanese phone king KDDI is showing off a MicroSD card with built-in Wi-Fi, sorta like those photo-uploading Eye-Fi cards everyone loves so much. Actually, they're just like that, except, well, micro.
There's not much of a space for a product like this now, since mobile phones account for most of the devices with MicroSD, and they generally have some kind of data connection anyway. But it's easy to imagine a (near) future where traditional SD cards are considered bulky, and a wireless MicroSD card would make sense. [Tech-on]