Wow ... something weird going on there. If I grab
http://search.cpan.org/CPAN/authors/id/M/MS/MSCHWERN/ExtUtils-MakeMaker-6.62.tar.gz by clicking on that link (in the browser), then
gzip -d and
tar xvf the file, it unwraps into a directory named 'ExtUtils-MakeMaker-6.62' (as expected).
I think that's the same tarball as wget fetched for you ... so we're left to ponder what's making the difference.
Is it something that wget does ? or gunzip ? or tar ?
It's hard to believe that wget could be the culprit ... more likely something that your gunzip or tar is doing.
And if it's only EU::MM that's afflicted with this condition (and not other source tarballs from CPAN), then it's even more mysterious - and, of course, indicative of there being something unique about the way Schwern bundles up his source tarballs.
Cheers,
Rob