This is the Perl.org Binary Large Object server. It's used by various perl.org sites for larger content files that we don't want to stash in Subversion.
We might be interested in getting mirrors at some point. If you have a gigabyte or two free and an occasional megabit or three of bandwidth to spare, then get in touch with us at webmaster at perl org.
Comments or questions to Ask Bjørn Hansen at ask@develooper.com.