"A Shark on the Network" is more appropriate than "How to listen in on wireless network traffic" for this particular post. If it's a "how to listen in...", I would expect the article to introduce better passive attacks (in monitor mode) and raw packet injection attacks that don't require you to be associated to a particular access point, and finally the different wifi chipsets that allow you to perform these types of attacks.
I was hoping to read some recommendations on chipsets that are able to monitor multiple channels simultaneously.. but then it was just another misleading headline.
