I'll be looking down at the sidewalks now, could very well bump into warchalking WiFi searchers

I haven't yet been taking my laptop out seeking wireless connections in this city, the low number of locations available from the paid services has me holding back. But thought this was pretty interesting:

Warchalking is the practice of marking a series of symbols on sidewalks and walls to indicate nearby wireless access. That way, other computer users can pop open their laptops and connect to the Internet wirelessly. It was inspired by the practice of hobos during the Great Depression to use chalk marks to indicate which homes were friendly.

I'll be keeping my eyes open!