[OSM-newbies] split an osm file gridwise

[Johannes Huesing]

I just downloaded a larger area via XAPI, and I would like to know if 
there is an efficient way to split the area up into n x m smaller areas
which are easier to handle by JOSM.

I know some Perl and use Gary's tools sometimes, but I am poor at 
PostgreSQL and the assorted OSM tools.
-- 
Johannes Hüsing               There is something fascinating about science. 
                              One gets such wholesale returns of conjecture 
mailto:johannes at huesing.name  from such a trifling investment of fact.                
http://derwisch.wikidot.com         (Mark Twain, "Life on the Mississippi")