> The idea is that if you drop this somewhere in public, you can try to match whatever color was there before so it is less noticeable that anything changed.

I *love* this concept so much.

Even though the books are a neat hook, these wifi networks could contain anything.

Grassroots political advocacy, local info for off-the-grid historical sites, location specific micro-social media (comments, message boards, etc.), waymarkers, geocaching, hidden music / art / games in obscure places, ARGs like an interactive capture the flag or something even more inventive and fun, ...

God, this is just so freaking cool and is begging for a thousand different ideas to run on top of it.

Good job! One of the best things I've seen all year.