This is a worthy blog entry from webnames.ca while they were promoting their .tel domain offerings. Read this and judge for yourselves:

Being in the middle of our .tel campaign and also in the midst of looking for a new house, it dawned on me how useful it would be if real estate agents and sales representatives all had a .TEL.

I keep thinking how simple it would be if the "For Sale" sign listed the .TEL address of the real estate agent or sales representative - eg. www.andyjones.tel.

It would be a snap to remember if you don't have time to note it down and it would allow you to lookup the .TEL domain name right on your mobile device to get easy access to the whole gamut of contact information (phone number, e-mail, etc.).

Get a leg up on you competitors and help me find you. Register your .TEL domain name before your competitors do.
I think real estate agents will not be the only professionals who should benefit with advertising through their dot tel domain extension. Basically most people who hand-out their business cards like sales people, listing agents, buyers and most professionals who get to meet clients and customers in person will soon see the benefits of having a .tel domain.