I have written here before about the need for web developers to learn more about GIS technologies and how to either work with or work around the traditional geographical software packages and data formats. There is a lot of synergy to be achieved in working together.
In the summer lull over at Hack de Overheid we are organizing a day of programming at a fortress which in itself already is a unique event: Apps for Noord Holland. But during the day the people from ESRI will give a workshop about geo data which we think is very worthwhile for any programmer who wants to get started in this field.
So if you want to spend a day on a fortress learning about GIS and programming, go right ahead and register. It promises to be a terrific day.