[eigenket]

While the second and third parts if your comment are complete true, the first part

> Entanglement isn't particularly useful for communication

I would say is false. Entanglement lets you do some fun and theoretically useful stuff for communication tasks. At the most basic level sharing entanglement lets you upgrade a classical communication channels you have into a quantum one (sending 2 bits and burning an entangled pair lets you send a qubit). You can do increasing fancy stuff if you so wish, if you are sufficiently paranoid you might be interested in device independent cryptography, which is only possible because of entanglement.

[roywiggins]

Yes, they are fun, but not notably useful, at least not yet. And only useful for pretty specialized tasks like key exchange.

[quantadev]

Isn't it true that in key exchange entanglement isn't used in any way shape or form for sending data, but only in making a determination that there was no eavesdropping on the transmission, because any eavesdropper would collapse the wave function.

So like you said, entanglement can't be used to send information, but it can be used to detect if the transmission was secure (I think)

[eigenket]

There are many protocols for quantum key distribution/exchange so it's hard to answer fully without knowing which one you're talking about. That said their are protocols, like the one invented by Artur Ekert in 1991, which use entanglement in an essential way to transmit the key. Even in the absence of an evesdropper the protocol will not work without entanglement. It escapes the no-communication theorem by also requiring some classical communication.

[quantadev]

Right, if you expand the scope of the discussion to other areas other than sending bits, there are various ways entanglement is used in various protocols. But none of them utilize entanglement to be able to get a bit from Alice to Bob faster than light can go.