As keen hackers Jez and his group wanted to experiment with uses for geographical data. When they found that there wasn't very much interesting license free geographical Open Data available, they decided to build their own. Openplaques.org is intended as a catalyst for external projects, which use it's APIs, and as an example of an Open Data collection system. This session will cover the openplaques site, the issues that it raises, Jez's experiences with building Open Data, and the external projects.