You have to register to use wireless in the park. (Score 1)

I just came back from Mellon Square in downtown Pittsburgh, PA. I spoke to Scott Legg, the regional sales manager for Grok Technology, about the system. They have wireless antennas set up in two buildings on opposite sides of the park so they get good coverage within the park itself. They have security on the system but they will let you sign up for free to try it out. They say it will work with PDAs as well as laptops. If you're in the downtown Pittsburgh parks today, look for guys with laptops and ask them about it. They don't have any booths or signs up so you have to hunt them down.