GE timeline...

Yes, this update is very cool. Three lines of code added to my little Ruby application with XML builder to support it:

xml.TimeStamp do
  xml.when(event_date.strftime('%Y-%m-%d'))
end

gets added to every xml.Placemark do

makes:

<TimeStamp>
  <when>2006-08-28</when>
</TimeStamp>

Which gives you a pretty floating toolbar...
that animates your map view. This was in the old enterprise client, but a little buggy and nowhere near as pretty. In a word...wow!