I accessed a sample of it through iTunes (preview).
Nice vox processing. I don't think there is a delay in there. It's a nice hall reverb. Long tail. Long pre delay. I think it's the pre delay which is making it sound like there is a delay in there. He's recorded it in a very dry vocal booth which sounds nicely balanced - ie I doubt it is a small boxy home studio one. Most likely a condensor mic, maybe about a foot away I would guess.
I think the main thing is it's a really nice reverb algorithm. Might even be an impulse. It sounds very smooth and complex. Lots of diffusion (a setting on most reverbs). It's in the mix quite subly. It's probably eqed quite well so it doesn't clash with the main vox and sits separate (pre delay helps with that too) and this helps keep the reverb strong but without pushing the vocal back in the mix - it's still very upfront.
It's possible there is a delay on there which has then been diffused with a heavy reverb blanket to hide it and make it subtle. So you might use a 1/2 tempo delay time and then run the wet delay through a reverb set to 100% wet with no early reflections or pre delay, and then blend that in with the original reverb that's also in there. But again, I suspect it's probably just the pre-delay that's giving it that sound.
It could also be possibly the early reflections that are quite strong and giving the 'delay' sound and then the 'reverb' is backed off sitting under that. The two might well have been separated and edited individually. Different equing to provide the right space, compression? Who knows. There are SO many things that could have been done. Experiment and see what you can come up with!