BTW "Perl 6 and Parrot Essentials" has been open sourced, in the hope that it will be kept up to date by the community.

I know that the Perl 6 part has seen some updates (it lives here in the pugs repository), the parrot half lifes in the parrot repository). It has updates as well, but I suspect that both parts aren't in a shape where you'd call them "up to date".

So if you're intersted in newer changes, you can also look at the diffs against the book. And if you want to contribute - don't hesitate to submit patches.