I recently read the story of the coffee shop that's shutting down their free wifi on weekends because it mostly gets them moochers who, far worse than simply not buying anything, sit and stare at computers and don't talk to anybody. They found that when they shut down the free network, they not only got people to buy more coffee, the place was also more social.
Internet economics, technology and issues
Voice over IP, a field I've been working in, has been generating some recent excitement. And that's appropriate.
However a lot of the talk is about something I consider the wrong direction. I call it PoIP, for PSTN over IP or worse, POTS over IP. (POTS, in turn, stands for Plain old Telephone Service.)
Almost everybody has a WiFi (802.11) access point these days. Some leave them open by accident, some deliberately, some turn on encryption or other security. Being open can be nice to neighbours and wanderers, though it can also be abused, and if you have insecure machines on the local NAT, it's risky.