title: How to have markers on a map cluster instead of stack
body: <p>my team is trying to resolve an issue with limited time.  We have developed a fairly complex map interface on our site to display content (trips, social content, etc).  when a user runs a search for "Kayaking San Francisco" for example, the map shows all the kayaking trips in SF, but since they are all geotagged (using geonames.org) to the same plan, the flags on the map stack instead of clustering.  i am poking around trying to find a solution - do you have any ideas?  we have RoR - <a href="http://www.ekoventure.com" rel="nofollow noreferrer">http://www.ekoventure.com</a> </p>