From Perl at a glance
The effective size [222 Mb] includes only the most current releases of everything in the Module List, and excludes perl distributions.
If they can programatically calculate the "effective size" and there is a real market for CPAN on a CD (ugh, why?) couldn't they just make an "effective CPAN on CD" and be done with it?
I don't see why anyone would even want a CPAN CD, since it would be obsolete almost as soon as its pressed. Unless you're using it to jumpstart a local mirror of CPAN, whats the point?