I just registered my first .tel domain: pierky.tel [dismissed now, I prefer to keep piercarlochiodi.tel only [dismissed too]].
IMHO it’s it has not been 😉 a good idea to have a central point of reference where all personal information are stored.
We have always more and more contacts, addresses, numbers, IDs; .tel can be a useful way to arrange them all!
More on .tel: Telnic FAQ