Unstrung takes a look at a project by Umbrella.net to wire Umbrellas with bluetooth connectivity. Via an umbrella with a PDA embedded in the handle, users create an on the move (and rather drenched) Mesh network whenever it rains. According to the group, the goal of the project is to create "sudden, striking, and unexpected connections between people in public and urban space", if you're in to that sort of thing.