> which formats actually depend on a prj file because they don't file their 
> projection themselves?
as far as I recall its only shapefile ;) There aren't many other 
standard vector formats.
Interestingly QGIS creates sometimes in parallel a *.qpj file, not 
touching the original one.
In geojson there is only definition of the projection as epsg code ¿I 
think?, not as separate file.

And for raster we have only tfw - but this doesn't include the 
projection/coord sys info. Interestingly I got recently data where they 
send me also a prj file with the raster data... so one would know which 
projection it is in.

my 2 cents,
stefan


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