I had the good fortune to see Lois Lowry, Jackie Davies, Kathryn Lasky, and Bill Thomson back in the fall of 2011 at an SCBWI New England event (I blogged about it here).
One of the take-aways I got was that NONE of these four creative people believe that writer's block exists. At least it doesn't for them. As professionals, they talked about just sitting down and getting on with it. Or as Jane Yolen says, Butt in Chair, Hands on Keyboard.
No "ums" "wells" or "buts" about it. No excuses. Just sit down and get on with it.
I just wish I had a picture--people, never go anywhere without your camera. Or at least, take a picture with your fuzzy camera-phone. Duh.
Theresa Milstein also blogged about this event back in October...she has pictures. :)
So, what are you waiting for? Get on with it!