I think that idea of a post-post-structuralism might be rather useful, summerflower. Not just for post-humanism, either.
I am keen to hear Montmorency1's contribution, too.
I've come across the term amongst those who are very keen on the continuation of the critiquing-of-the-Enlightenment project, particularly those who follow in the wake of modern readings of Nietzsche and those who are fond of Deleuze.
It seems (as might be guessed from the title) to have an aim of undoing some of the premisses based on an unexamined supremacy and centrality of a human perspective, and embedded and unreflective notions of what "a" "human" "subject" is.
I'm thinking of examples. I met someone working on a thesis that we "become" multiple organisms when we join political collectives, and pursuing this idea vigorously would take us away from notions of a unified political subject, with an essential alliance, permanently, to one political identity. Instead, "identity" is multiple, relational, fluid. Multiple not only in the Lacanian sense of being riven through with otherness, but also multiple in the sense that we really do form non-unitary subjects with other people, with ideas, and so on. Our identity is also formed in a "real" sense outside the confines of our bodies.
All that is very human, though! I've met other people who are very into the whole idea of "becoming animal".
I'm quite interested in writers who have suggested that god is a useful way of positing, and thin king about, the beyond-human. Not just Levinas, some Catholics too. I wonder how that would sit with Nietzsche? I think he'd insist that we need to create new means of thinking about this.
I'm really interested to hear from an actual post-humanist, though.
And I think I might follow summerflower into a bit of on-line reading.