I speak only for me of course. If the stabiilizer included in Vegas 10 is Pro Dad's Mercally, I already have it. And besides of this, I prefer SynthEyes for stablilizing. What I would like instead, and what I probably will miss also in Vegas 10, is a simple tracker.
Using a tracker, I can have one video track following the movement of a certain image detail in another track. Using two track points, even rotation and scaling can be applied. Yes, I know Vegas is not After Effects, and maybe this is not a task for Vegas..
Ingvar