Heavily paraphrasing:
For local purposes [“rationalists” seems suitable]. For outside purposes [I use a description not a label]
I think it’s pretty much impossible for us to have any sort of private label for ourselves. Even if we were to use a label for ourselves within this site and never use that outside of the site, that use of it within the site is still going to be projecting that label to the wider world.
Anyone from outside the community who looks at the site is going to see whatever label(s) we employ. And even if we employ a label just on this site, it’s still likely to be part of the site’s “reputation” in outside circles -- i.e. the label is still likely to reach people who've never seen the site.
A lot of the content on Less Wrong is describing various types of mental mistakes (biases and whatnot). In terms of this aspect of the site, Less Wrong is like a kind of Wikipedia for mental mistakes.
As with Wikipedia, it’s something that could be linked to from elsewhere – like if you wanted to use it help explain type of mistake to someone. There’s a lot of potential for using the site in this way, considering that the internet consists in a large part of discussions and discussions always involve some component of reasoning.
Seen in this way, the site is not just a community (who could have their own private terminology) but also an internet-wide resource. So we should think of any label as global, and I think that's more of a reason to consider having no label at all.
Here's an example of such external referencing of Less Wrong posts
http://www.37signals.com/svn/posts/1750-the-planning-fallacy
I've noticed that here on Less Wrong people often identify themselves as rationalists (and this community as a rationalist one -- searching for 'rationalist' on the site returns exactly 1000 hits). I'm a bit concerned that this label may work against our favour.
Paul Graham recently wrote a nice essay Keep Your Identity Small in which he argued that identifying yourself with a label tends to work against reasonable -- rational, you might say -- disscusions about topics that are related to it. The essay is quite short and if you haven't read it I highly reccommend doing so.
If his argument is correct, then identifying with a label like Rationalist may impede your ability to be rational.
My thinking is that once you identify yourself as an X, you have a tendancy to evaluate ideas and courses of action in terms of how similar or different they appear to your prototypical notion of that label - as a shortcut for genuinely thinking about them and instead of evaluating them on their own merits.
Aside from the effect such a label may have on our own thinking, the term 'rationalist' may be bad PR. In the wider world 'rational' tends to be a bit of a dirty word. It has a lot of negative connotations.
Outside communities like this one, presenting yourself a rationalist is likely to get other people off on the wrong foot. In many people's minds, it'd strike you out before you'd even said anything. It's a great way for them to pigeonhole you.
And we should be interested in embracing the wider world and communicating our views to others.
If I was to describe what we're about, I'd probably say something like that we're interested in knowing the truth, and want to avoid deluding ourselves about anything, as much as either of these things are possible. So we're studying how to be less wrong. I'm not sure I'd use any particular label in my description.
Interestingly, those goals I described us in terms of -- wanting truth, wanting to avoid deluding ourselves -- are not really what separates "us" from "them". I think the actual difference is that we are simply more aware of the fact that there are many ways our thinking can be wrong and lead us astray.
Many people really are -- or at least start out -- interested in the truth, but get led astray by flawed thinking because they're not aware that it is flawed. Because flawed thinking begets flawed beliefs, the process can lead people onto systematic paths away from truth seeking. But I don't think even those people set out in the first place to get away from the truth.
The knowledge our community has, of ways that thinking can lead us astray, is an important thing we have to offer, and something that we should try to communicate to others. And I actually think a lot of people would be receptive to it, presented in the right way.