A
Mental Head's-Up-Display. This is something I wish I had. Imagine being able to instantly annotate something in your
mind and have it appear in your
field of
vision, available for your
perusal at any time, and
static. This would come in very handy when organizing your
thoughts, trying to remember a
phone number or
address, coming up with
Things To Do Lists, and so on.
Actually, we already have something sort of like a mental HUD; we can visualize things in our mind quite easily. However, it's not static, and if you visualize a phone number and then become distracted doing something else, you are likely to forget it.
A good example of a mental HUD is the one that the Terminator has in the movies of the same name.