http://bbs.keyhole.com/ubb/showthreaded.php/Cat/0/Number/345310


New Features in 3.1.0
---------------------
"Categories mode" now allows Quantities (class breaks) as well as
Categories (unique values). Placemarks will now use the legend
labels instead of the actual values. The ArcMap default is that
these two are the same.

Coordinates are now all double precision

For using an attribute to calculate the heights, European-format
decimal commas will be replaced by points.