I saw this really neat concept on The Screen Savers today: Yellow Arrow.
Basically, you get these yellow arrows with a unique number on them. You stick the arrow somewhere in the world pointing to something significant to you: the corner store, a lamp post, in the mall, etc. Then you send a short text message about what the arrow is pointing at to Yellow Arrow's central server. Anyone who comes across the arrow can then send a text message containing the unique number on the arrow to the server and get back the message you put in.
It's a novel idea with an endless number of possibilities. Kinda like a hyperlink in real life!
The arrows can be ordered off the website for $0.60 per sticker. Of course, it helps to live in a city with more than three buildings downtown and more than a handful of interesting locations. ;)
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