From "The Thinking of Being and the Question of the Other" in Of God Who Comes to Mind:
We have asked whether the Other--who refuses identification, that is, thematization and hypostasis, but whom the philosophy of the tradition attempted to recover in the patience of the concept through the methodology of history as self-consciousness--must not be understood wholly as otherwise, in a putting in question of thought by the Infinite which thought could not contain; in the awakening. This is a putting in question and an awakening which are reversed into the ethics of responsibility for the other; an incessant putting in question of the quietude of the identity of the Same. It is a susception more passive than any passivity, yet an incessant awakening, a waking up in the midst of awakening that, without this, would become a "mood," a state of wakefulness, or wakefulness as a state. A thought more thoughtful than the thought of being, a sobering up that philosophy attempts to say; that is, which it attempts to communicate, and this, if only in a language that ceaselessly unsays itself, a language that insinuates.
The strong above is perhaps the most concise definition of postmodern metaphysics that I have encountered. I am currently working to equate the encounter with the screen as both an encounter with another(s) (other "sames" made other by their digital response-ability) and an encounter with the Face of the Other (Infinity). The screen can be passive in its presenting infinity, in its resistance to be said as any one identity. Of course, we also experience it as active: as comments, responses, mail, spam, as the presence of others (whose responses often question the primacy of my own thought).
This essay, "The Thinking of Being" is my favorite Levinas I have read. It is short (a mere ten pages), but outlines many of Levinas' key concerns. If you've always wanted to know why Derrida considers indeterminacy such a big deal, read this essay (specifically page 116!)