Public service announcement
If you are planning a departure from Stockholm Arlanda airport, you might be interested in this live graph I created to keep an eye on the waiting times in airport security. It collects and plots the data reported by the airport itself via RRDtool.
This is a quick-and-dirty solution for my private use case, so please make sure to carefully read and understand the whole page (including the disclaimers) before making any use of it. Do not forget to always check the airport’s official status page as well!