Hornet for Blackberry, real-time address book (Will .tel kill the phone number?)
hornethub.com
hornethub.com
You can use NAPTR/LOC/TXT records for any domain name you like, providing you have sufficient control over your DNS zone.
However, many domain owners either don't have this ability, or lack sufficient knowledge to manage them. Many people, even businesses, don't even own domain names. .tel comes with tools and services that make it simple.
In terms of privacy, you can encrypt specific records that only certain friends/groups can decrypt and read, so you can absolutely keep your phone number private. As a bonus, you could become liberated from it and can change it seamlessly, without having to tell any of your friends.
I believe I heard that Michael Jackson used to change his number on a weekly basis - obviously an extreme case, but you get my drift.
A .tel domain may be great for the first person to get a popular .tel name, but it sucks for everyone else. And for that reason alone, it has no chance of replacing a telephone book.
Also, it is an expensive, proprietary, unscalable solution to a problem that doesn't exist.
One shouldn't assume that the John Smith you know has JohnSmith.tel, but to use a specialised search engine to find the correct one. You may already know one piece of his contact information, his location, or some keywords that might define him.
It's hardly expensive ($10 /year). Everything is open source and compliant with preexisting standards. You can run your own TelHosting provider if you want to. It's decentralised (obviously). Why would you say it's not scalable? DNS is the most distributed and well balanced network that we have.
Finally, you OWN your data. There is no malevolent third party.