I experienced something similar...on my new '07. About a thousand miles after taking delivery of my new '07, I was out for a ride, and I got up to speed and realized I hadn't secured the straps on my helmet, so I took both hands off the grips to secure it, and as my bike began to slow, the bars started a bit of wobble that got progressively worse. I stabilized it and tried it again. Sure enough, same experience. The bars would have completely flopped from side to side, I am sure, if I'd have allowed it.
I also noticed that my bike seemed to be a bit more "sensitive" to the road. I took it back to the dealer and he took it for a test drive. He came right back and said the Steering Head Bearing needed adjusted. He took it in and made the adjustment. Steady as a rock-et now, and I'm a really happy camper.
Just my $.02.