Here comes the subliminal assistant
Wired has an article about a system that prints subliminal messages on your glasses, to remind you appointments, shopping lists, etc.
DeVaul said subliminal messages aren't powerful enough to stimulate action; rather, they act as prompters -- they fill in the blanks that the wearer is already searching for. The fact that the wearer is unconscious of them is, according to DeVaul, the key to his system.
"We can never precisely know what the wearer needs to know, or when he needs to know it, and this is why the fact the messages are subliminal is so important. If the information given is not helpful at that time, it's not important because it isn't noticed," DeVaul said.
Sounds pretty cool! If it works...