Entered my GOES number at least a year ago, got the Pre-Check E-mail today, logged in and Opted-In. My GOES number was now listed in the "Redress Number" field (as that's what the form called that field when I'd entered it back then) so I'd re-entered it into the "Trusted Traveler" field- but it wouldn't let me remove the number from the "Redress" box, so it's in both places now. Guess it can't hurt.
I'm essentially done with weekly travel since July, but I've got ~360K RRs to burn thru so I guess this'll help (esp. since I'll be losing AL+ end of 2014).