Are you better off with longer spelled out domains or shorter domains or does it really not matter?
supersitetalk.com
or sstalk.com
In this example the long domain is infinitely better than the short one. For a lot of reasons (unless you're starting a discussion site for Nazis).
I'm not sure where the prevailing wisdom in this thread is coming from, but in every study I've ever seen that relates to domains (yes, there are such things) I have never seen evidence that there is user resistance to long domains that make up a phrase or a name. In fact, people prefer them to short acronym domains, because they have to mentally translate the full product or company name to the acronym in order to type it (though that would not apply to a model number domain like 318ti.org).
There is a limit to how long a domain can be and still be useful, so you can't use a really long phrase. But there are
millions of two word domains out there for the picking if you are even mildly creative. Or use three words. That's still not too long, and you'll have yourself a descriptive domain, which is better than a short meaningless or acronym domain.
Sure, a three or four letter word .com, .net or .org is a great thing. But don't let
the quest for shortness saddle you with a bad domain.