For our March Maptime, Shaun Walbridge is going to talk all about GeoJSON, TopoJSON, Shapefiles and your other favorite spatial data formats.
Update: The spatial data formats talk is up at https://4326.us/maptime-data-formats, with a full repository up on Github. We also had a few additional tools and formats come up in the discussion:
CartoDB is sponsoring Maptime this month and will be buying pizza for us!
Beginners are encouraged, and be sure bring your laptop.