50% of the new CPAN uploads lack a repository link
I just checked the 1000 most recent CPAN uploads. 504 of them did not have a link to the repository of their source code. I was quite surprised by this. After all we are talking about open source code where having a link to a public version contol system can increase cooperation.
So I put together an article on how to add the repository link to the META files. It is very simple in all the 4 major packaging systems.
I hope this article helps, and more CPAN authors will include this information in their distributions.
(I know that META CPAN just moved, and it might not have been fully updated, but I also checked the number of packages without a license field and it was 169 out of tha 1,000 quite similar to the number I saw a week ago when I wrote about the CPAN uploads without license in the META files. So I think this is quite close to the correct number.)