The nVidia ion is small enough to fit lots of other hardware into the PC, which I would imagine can allow for some pretty creative and practical features!
So, I decided what would be extremely useful for people like myself is having a revolving CD rack that auto-loads CDs into the DVD drive!
Basically, the main PC would be a small box. Its DVD drive would be like that of the Wii, in that it automatically pulls the CD in when it comes near. Instead of loading from the front, it would load from the top. A small motor inside the main box would act as an axel for a cylinder containing all your games. When you select what game you want from a keypad on the computer, it will spin to that disc and drop it into the DVD drive. =)
To give a general idea.