What new feature in Adobe CS4 gets you excited about creating something new?

For me, it's easily the new motion tween model in Flash CS4. Automatic keyframing, instantly editable motion paths, and the power of the motion editor allow me to create complex timeline animations in a fraction of the time. It's similar to the timeline in After Effects, which I always thought had a great animation system.

No matter how small, which new feature is your favorite?