* Geocoding is rate-limited and happens on an ongoing basis in the background so that large imports can complete promptly. To respect rate limits you must call maps.geocode() from ONE process (in a typical single-process node app that's normal, but be aware if you use clustering or multiple servers).
* Autozoom and autocenter. If you don't specify an explicit center object with lat and lng properties, you get autocenter. If you don't specify a zoom level (such as 12 for "city"), the map fits the bounds of your points nicely. No more hardcoded center on Philadelphia (unless you specify nothing at all and have no items).
* Fixed bugs.