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Meh, in fairness, even if you can't stab people with it it's hard to argue that a tail blade of some sort would be worthless. I mean, I know that *I* wouldn't try to grab a tail if the creature pulling it out of my hands would likely sever all my fingers.

Personally 2ed Tieflings...The whole ancient races and they are all brethren is rather weak...so on the opposite side of the coin are aasimars going to be a ancient race bred with the upperplanes and they are all brethren.

I prefer each tiefer is different approach. Decide what sort of Lower Planar you were mixed with and go from there...some have tails...some have hooves...some are slimy...some have feathers...etc

Some have normal tails...some have prehensile tails...

Just make it your own IMO and if you have not seen what is out there check out some of the old PS materials for ideas.

Here's my opinion. The PHB simply states the tail is non-prehensile. Which as other's pointed out means that it cannot be used to pick up things or to hold the Tiefling's weight from a branch or something. Although the PHB does not state any rules for using the tail to attack, this is no way means that it would not be able to. Non-prehensile does not mean that you don't have muscular control over your tail, it simply means that (probably do to limited flexability) you can not wrap it tight enough around something to hold it. So when a PC asked me if he could use his Tiefling's tail to attack. I did some research. Using both some 3.5 supplements as well as all available 4th edition supplements. I have one word for you. "Dragons". Dragon's tails are non-prehensile, yet they can still use it to attack... ergo Tieflings can use their tails to attack as a natural weapon! All the dragons in the 4th edition MM have been raised in size so that none are "medium" creatures. That's where my 3.5 came in handy with the "Creating Monsters" section. Which stated a medium creature's tail attack would deal 1d6+STR damage. So there you have it. I gave my PC the ability to use his tail as a weapon. Then he asked me what type of damage it would do. I told him, choose! I let him choose between bludgeoning or slashing at character creation but he had to keep which ever he choose. Why slashing? Because one of the Tieflings in the PHB seems to have a sharp boney ridge on the end of her tail.. thus slashing as each tiefling is different right? Finally if you don't wish to give your PC an extra basic attack to choose from (as I told him it cannot be used for powers) Then take a look at the dragon entries and have him choose 1 of their Tail at-will powers. Ex. (From Black) "Everytime an opponent misses, the dragon can use it's tail to attack as an immediate reaction at-will power" or the reds, ability to use it whenever someone flanks him... anyway there's my two cents

You can always arrange with the DM a house rule that the tail attack is actually a RP attack. That is, you roll as if you were attacking with normal hand attack, but actually you spin and slam the target with your tail
Maybe it is even possible to find a magic item (dagger) that you can attach to your tail, or if you have high strength / constitution you are able to lift or pull light items.
RP it :D