I started with a .us .
The word had come to my mind that day and when I ( by mistake ) found yahoo domain registration I was even willing to pay $70 for the 2 year registration. This domain is still more worth to me than any other one and I will probably keep it forever and a day.
Unfortunately I can´t manage this domain recently (check my other thread for it and possible help, please ).
Anyhow, I then tried all "useful" words to see they were all registered, but I got some more in the meantime.
I have sold a few names to end-users and can´t complain, but this business is taking a lot of time away from me, time I have no more (and never had...it´s called missing sleep ).
I still class it as good fun and as long as I make more money than I spend that is fine. (P.S. but don´t tell my hubby : this is such a great community here that I would not want to leave...)