I'm one of those people who has been lurking on Nikonians for about 5 years without posting a thing. First off, I'd like to thank everyone for tremendous amount of useful info I've picked up here.
I'm posting now to add another datapoint to the D800 AF thread. I received my D800 in late June, hoping that the left AF issues were over. No such luck. I was pretty quickly able to confirm my body had the problem. I sent it in to Melville in mid July and received it back 5 weeks later. I paid for the shipping to Melville.
My 'fix' came back exactly as described in other posts. The left focus point was pretty good. But now the center focus required between +15 and +20 AF Fine tune with all of my lenses (about 6 I tried). And once I dialed that in, the left was out. I picked up a copy of Reikan FoCAL and after that gave very consistent results, confirming what I'd seen on my own. FoCAL is recommending values of +18, typically.
I called up Nikon service on Sunday. The woman on the phone looked up my previous service, and with no argument whatsoever said they would take it in for service again. I didn't need to submit any test images. This time they sent the prepaid mailer label. I dropped the body off at UPS this morning. I will post the results of the second attempt when I get it back.