As you may know, all three character .com and .net domains are all gone. Meaning, one person or another has registered them and there is no way to get your hands on it from any registrar. You have to find the owner and buy it off him and trust me, it’s not as cheap. Three character .org domains are still available but very few and one of those characters have numbers in them which arent very valuable.
Well four character domains are also getting registered like crazy these days and see if you can get your hands on any of them. In my lifetime, I’ve held about 4 four letter domains and another 4 character domain, it had 3 letters and 1 number in it. As you can see, this blog is one of my 4 letter domains and it is actually the only one I still have left. So don’t stand there and watch all those domains get registered, you can get them now and sell them for a profit later on when all four character domains are gone.