Gucci sells glasses with projection-functionality.
Supporting the ipod this seems to become the gadget of the summer for the wealthy.
Through wireless connection with the Ipod, Videos, Photos and Books can be viewed floating in midair.
Most of the power comes from an integrated rechargeable battery. There is another pair of glasses planned which get a part of their power from solar cells.
Also a connection to your cellphone is possible. Incoming SMS-Messages and calls can be read or accepted by pressing a button on the glasses.
Update: There is already such a device: http://www.myvu.com/
But of course it's not wireless, because the ipod has no wireless functionality yet. Furthermore, there seems to be still some need of development, to improve the product, if you read the comments here: Myvu in Apple Store