Seems appropriate to me. Having a PerlMonks namespace on CPAN might even encourage others who have written PerlMonks-related utilities to turn them into modules.
Yes, I always wondered why there's no such (Update: root-)namespace yet.
But let me suggest PerlMonks as the CPAN root namespace (if that is legal),
leading to PerlMonks::Tk::PMedit or PerlMonks::PMedit since
a lot of PM specific modules might not belong into the Tk-category.
Some weeks ago, I dusted off some scripts from the Code Catacombs which might
find their way into PerlMonks::XP some day...