I've noticed this sound in a few indie-ish songs lately. It's a deep vocal sound but also sounds synthesized. I've noticed it so far used by crystal castles in a song called "celestica" ( Crystal Castles - Celestica (High Quality) - YouTube - about 1:30) as well as purity ring on most of their new album. One specific example is "lofticries" ( Purity Ring - Lofticries | HD - YouTube - you'll notice it right away). Just a general question: how can I achieve some sound close to this, do you think the samples are original, or that they are synth-based? Do any particular synths come to mind?