IMHO .tel can only make .mobi shine. I havent read all of these posts, and don't have that much knowledge of .tel, but I know some and learning as I go on. (If I am wrong, please correct me).
To me, .Tel is just another name out there to be an alternative to .com Even though I know its about contact and not websites ect.... (it's a simplified way to reach a company as so I am learning and reading about it....) But can a "dot.com, dot.net ect..." find the contact information about a particualr company "or is it just (.tel) that can reach a contact ect..." and also, can a cell phone reach a contact....? To me this is so unecessary, it could be usefull though, but thats what people said about .mobi IMHO
One of these days, people are gona be confused of all of these new extentsions out there! But I will admit, that I am a .mobi supporter, becuse I do believe that it is totaly different and serves a great purpose for the enduser!
Also, I just had a brainwave, I think .tel should only be for tradmark holders and professional firms, since that is really the only reason why somone would type in a .tel, to access it. It should be limited only to corporations, And then I could see a use for it. I also can see that people may reg it to be an alternative to .mobi, but.......