A Marpa mailing list
Ruslan Zakirov has started a Google mailing list for discussions about Marpa: firstname.lastname@example.org -- I am grateful to Ruslan for doing this and plan to follow the mailing list.
On another topic, I will be removing the "bare name" version of Marpa from CPAN shortly. The "bare name" Marpa is a legacy, deprecated version and is simply causing too much confusion, with search engines and elsewhere. The official, stable version of Marpa remains Marpa::XS.