This will be very short, and not so sweet, kids...
I run at night, while the wee babies are dreaming of a more fit daddy, and the woodland creatures are doing their best to scare me from the roadside (and they do).
I have my iPhone with me for tunes, but I felt that I didn't look stupid enough, so I came up with a chest-mounted ground projection rig. It both illuminates the path (and armadillos) directly in front of me and displays information, such as mileage, time, maps, etc.
I like it. It could be more comfortable to wear, but that's for version 2.
One iPico iPhone projector (only $85!)
An iPhone padded running case
You can project anything on the ground, like Google maps while GPS is running, Youtube videos of countdown digits, etc.
I chose to write myself an iPhone app which does a few things:
1. Displays info I want, such as my mileage and the current time
2. Only projects info when I touch the screen for stealthier animal evasions
3. Constantly samples the iPhone gyro and accelerometer and counter adjusts the projected image. This results in less sway and bounce in the projected image on the ground while running.
The third feature is in prototype phase, so I'm not releasing an app yet (ever?). It works well enough, and the effect is a greatly reduced bouncing of the information circle on the ground in front of me. It feels neat, like an augmented Google Glass display, only everyone can see it! Extra dork points! :D