I spoke yesterday at the Scottish QGIS user group. This is a vibrant and welcoming community and has attendees who travel long distances to be there. I think this time Prague was the furthest city anybody came from.
My talk centred on network analysis using GRASS, R and QGIS. You can read how to do some of this work here and here. Watch the presentation (and the rest of the day) on Youtube and view the slide deck at the end of this post. A massive thanks to Ross, Tom and team for organising the event.