When I look at Devel::Size, 0.72 is linked as the "latest release".

Indeed it is :) But I failed to notice that. However;

• a search in cpan does not show it: http://search.cpan.org/search?query=Devel-Size&mode=all
• the module page does not show it: http://search.cpan.org/~tels/Devel-Size-0.71/
• and neither cpan shell: http://img52.imageshack.us/img52/5326/develsize.jpg

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I did offer to take it over, but apparently the existing two co-maintainers couldn't agree to that.
(...)
Dunno what more I could have done?

Then, perhaps fork it as "Devel::Size::Improved"? License permits it. And the other two co-maintainers can still keep their precious namespace to themselves (even if they'll do nothing with it;)