If you've only got a few thousand, then MarkerManager will do the job. 
Simply specify that all the markers have their minZoom set to 16.

In fact MarkerManager will cope with many thousands of markers, but the 
time needed to fetch the data for many thousands of markers starts to 
become significant. (Estimate the fetch time by taking the length of 
data for one location, multiply by the estimated number of locations, 
multiply by 10 and divide by a million to get the approximate time in 
seconds on a 1 megaBit/sec broadband connection.)

If that time starts to look excessive, consider using server side marker 
management.

Hints:

Use one manager.addMarkers() call, and manager.refresh(), rather than 
thousands of manager.addMarker() calls.

Use the Open Source MarkerManager. It's got some fixes that 
GMarkerManager doesn't.

You can reduce the amount of data per location in the initial load by 
removing the infowindow data from that file and fetching it from a 
server for an individual location only when it's actually needed.

-- 
Mike Williams
http://econym.org.uk/gmap


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