Marxists.org published Nicolas Allen’s translation of the Boletin Marxista 8, probably the best political account of what the Posadist movement was from its ex militants:
In this document, these former Posadists offer a balance of their time in the movement, a political diagnosis using the history of Marxist-Leninist-Trotskyist thought as its instruments. Despite the technical approach, the drama of Posadas’s megalomania and the cult-like ascetic lifestyle he demanded of his militants appear as elements, along with a reckoning of their complicity in its development. The documents is also concerned with the general failure of Trotskyism to achieve it goals, exemplified by the BLA split that they call “the most tragic step to ever be taken by a tendency of proletarian origin,” which they caution should not be reduced to “a question of simple individual madness.”
I also got a shout-out from Argentinian journalist of paranormal culture Alejandro Agostinelli in this transcribed interview about the Posadist movement for his Blog. Expect a lot more Posadist stuff soon!