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Should I store latitude and longitude as strings or floats (or something else)?
(I’m using activerecord / ruby on rails, if that matters).
Update:
Mysql in development and postgresql in production (why does it matter?)
If you need to do more complex geographical calculations, you can investigate PostGIS for Postgresql or MySQL Spatial Extensions for MySQL. Otherwise, a float (double precision might be a good idea) should work.
Edit: It looks like the GeoRuby library includes a Rails extension for working with the spatial/GIS extensions for both of the aforementioned databases.