Here is my two bits:

I would prefer one scene file. That should be a scene that uses as many
of Pov's features as possible, perhaps with the exception of those
dependend of bitmaps, to avoid having to download large bitmap files
along with the benchmark scene file.

To get around the problem of a slow enough scene for state of the art
processors being too slow for older systems, I propose the following
system:

The benchmark should be expressed as the speed relative to a reference
system (like Andreas Tillner's ChessMark (see www.tabsnet.de)). On the
reference system (say a Athlon 1GHz, 64MB RAM, Windows, official PovRay
compile), the scene is rendered at several different resolutions (say
from 320x240 to 3200x2400). On fast system you choose a high resolution,
on slow systems a low resolution for running the benchmark. To avoid
timing inaccuracy, a minimum render time should be set. 

/Ib

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