Argo is an experimental way to help people make maps more easily. Technically, it's a few Backbone views that take a config file (here's an example) defining map options, GeoJson urls, and style rules. Practically, it allows people generate open source maps without (much) custom coding. GeoJson + style config = automagic map.
Initially, we plan to integrate this with PlanningPress to enable planning agencies to make maps through a simple WordPress interface, but this could be used in anywhere.
This is very alpha and has no guarantees. Have fun!