The __DATA__ handle and __END__ tokens are described in perldata.pod, perlpod.pod, and perltoc.pod.

Try to use OO techniques when you want your libraries to be big, difficult, and slow.

Others have apparently recommended the use of h2xs, note that h2xs has internal pod documentation, as does ExtUtils::MakeMaker. After using h2xs to create a skeletal directory, and after you have edited all the files appropriately be sure to use:

    perl Makefile.PL
    make dist
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in order to package your module in a manner suitable for putting on CPAN via PAUSE.