I helped to improve the front page for this system, providing a table that also references the justification (Apocalypse) and explanation (Exegesis) for each part of the spec, where available.
Also collaborating with agentz, we brought
Perl6::Perl5::Differences online as an HTML, linked to from the same page.
The Differences doc is still very much a work in progress. It needs to be extended, organized, and further cross referenced with the spec so readers can easily jump to more detail. With Agentz's smartlinking script, it's fairly easy to create links to the spec from there, too.
See the result: