I've really gotten into this, because Aussies are both an NBT breed AND traditionally docked. You can get quite a few tail lengths in any given litter, from the NBT, to 1/4, 1/2 and even 3/4 length before hitting a full tail. I've been seeing a ton of pictures of full-tailed Aussies and I have to say...I still prefer the NBT/docked look. What's crazy though, is that over in Europe with this dock/crop ban they've got going, you can't even import an NBT into some/many countries. Has to be fully-tailed.
And at least in Aussies, somewhere in the pedigrees/papers it makes mention of whether the dog was tailed or NBT at birth, because you're not supposed to breed two NBT's together...apparently increases the risk of spinal defects. I wish I could find this link I'm thinking of, it was a case study on 20 odd Aussie litters and revolved around tails.