P.S. Kevin, your solution fails where the linked list has length less than three.
P.P.S. Chris, hope things are going well. Interesting problem. The spec should probably say “flip 2-tuples” or “flip pairs”, though, as a “tuple” is just any ordered list.

while( notDone ){
zeroth = node.prev
first = node
second = node.next
third = second.next

if(zeroth != null){
zeroth.next=second
}
second.next=first
second.prev = zeroth
first.next=third
first.prev=second

if(third != null){
third.prev = first
}

//If no more after this pair, or only one more, end
if( third == null || third.next == null ){
notDone = false
}
else{
//skip up to the next pair
node = node.next.next
}
}