One thing I've always had a problem with as a writer is turning off my brain. No, not all of it (although sometimes I think my prose reads like I had), but rather the analytical part that sits back in it's cerebral Lay-Z-Boy and takes pots shots at what is going onto the page. In other words, my internal editor.
I am by nature a bit of a perfectionist when it comes to writing, so this isn't a huge surprise for me. However, in the last few years, I have noticed it takes longer and longer, and becomes harder and harder, for me to move forward in a piece of fiction. This is not necessarily becasue I am constantly going back and revising (I actually try to avoid that, since it is huge pitfall for me), but rather it is my constant working and re-working of a paragraph or sentence to get it "just so." It's kind of like Kelly's comments about the "right" vs. the "perfect" word, except I am looking for the perfect phrasing for a block of text (or page, or chapter ending, or what have you).
I've tried all sorts of things to short-circuit my interal editor, but have never really been successful. I've found that I can sometimes consciously get myself to push forward and say "to hell with it - I'll fix it later", but that is a rare thing for me, and it never lasts.
The editor always comes back, always nit-picks, and always ends up frustrating me because I know what I have is fine, I should just move on - except I can't.
So my question is, how do you deal with your internal editor? How do you keep yourself from circling the same territory over and over (and over), and instead move on?