Things I think would be neat to tweet as they happened, using an arduino as a detector of the occurrence:

1. Even though this may seem trivial, I always want to know when people are going to sleep and waking up. If I need to contact someone and it is a questionable hour of the day, ie, sometime in the late hours of the night or early hours of the morning, it would be good to know if I would be waking them up if I called or getting a response to a text anytime in the near future. This would probably work by putting a button or a sensor under their pillow and it sending a tweet when the head hits the pillow.

2. I think it would be really neat to know when someone is thinking about you, or talking about you. One way that someone may be aware of this is if someone typed your name, which would basically be a specific series of letter in a specific order. It may be nice to know if specific people typed your name, and the keys could send a tweet saying that ___ is thinking of___.

3. Using the TTL Serial JPEG Camera with NTSC Video I think it could be really cool to take pictures of people as they enter and/or leave a specific space, upload it to an image site, then tweet a message that contains the time the person entered the space along with the link with the photograph. Not exactly sure what that space would be, but it would have to be a location that mattered to a few people at least. It would be almost like a security camera taking photos instead of endless streams of video.