Statebins as sp object?

[hadley]

How hard would it be to create statebins as an sp object with reasonable lat and long values? I'm thinking about modifying geom_map() so it can take sp objects as input, and switching between actual state borders and binned border would be interesting.

(That would also make it easy to generalise statebins to other shapes)

[hrbrmstr]

Totally missed this. Apologies. Actually, this is the plan moving forward. I just need to make a set of square polygons to go with the hex ones I have. Then I can replace the geom_tile with geom_map.