[OSM-talk] updates for mapnik coastline-source?

[StilgarBF]

Hi,

does anyone know when or how often the shoreline/coastline/shapefiles 
are updated that Mapnik uses to render coasts, islands ... ?
the Wiki says: "every few weeks"  
(http://wiki.openstreetmap.org/wiki/Coastline)
But what's that supposed to mean? 2 weeks? 4 or 10?
Is this a process where someone manually updates the files or is this 
done by some kind of cronjob?

Is there a way to find out when these files have been updated the last 
time?

thanks
Stil