Thanks guys, I appreciate it.
The entire family was with him when he went, and it was probably about as peaceful as it gets.
Fortunately he'd made his wishes about not being kept on life support known, and there were no problems with moving him from the hospital to hospice. However, I'm going to make that trip to a lawyer that I've been putting off for years, to get something official drafted up for my wife and I. And I'm leaving a "medical power of attorney" with a friend, in case my wife and I both wind up flatlined by a car wreck or something. We'll be holding theirs, too.