In between other stuff I also found time to play with the touchatag rfid reader I ordered.
Some of the things which got me interested which I previously did not mention:After an article in the Dutch magazine PC-active how easy it is to access your data on the ov-chipkaart people (naturally) got interested again. People on the site www.ov-chipkaart.org started decoding the card. Resulting in a wiki with all known data on the ov-chipkaart decoded which got implemented as open-source scripts to decode and view your own ov-chipkaart dump. Including lists of known station numbers.
In true open-source style: a lot of cooperation (browse the comments on the ov-chipkaart.org site to see this happen) and people sharing the tools they wrote so other people can improve them.The next implementation of the ov-chipkaart with better security, positive effects for the traveller and improved privacy for the traveller can learn from this. Give people access to their own data (and not just through a crappy website) and learn from projects like the one above. Transportation rfid cards from other countries also get decoded, read for example Public transportation passes and their secrets