I dont think your camera mount was as secure with your old camera. sometimes the lighter cameras will move around more, because its thougth that they dont need the anchoring, but they do.

That shake has nothing to do with the mount. It is the CMOS rolling shutter effect. I also have learned it has nothing to do with the OIS. CMOS and OIS are two different things.
Look for other examples here on Vimeo

More examples of CMOS/Rolling shutter effect:
vimeo.com/819044
vimeo.com/813537
vimeo.com/813505
vimeo.com/604275

That is an excellent camera.
If you were going to use it for race videos (rare) then don't get a cmos cam.
It's meant for normal usage and those who want filmlike quality on a budget, not extreme sports.

Well- the Panasonic SD9 was bad too. I returned it. I'm just going back to my trusty Digital 8 camcorder until something better comes out.

I think if u use cam to shoot race,u can use a stabilizer like this:
photobbs.it168.com/attachments/month_0801/20080114_9ae029c0ca9151e78597nusUHh0E60AP.jpg

Any luck with the SD9??? I have HF-10 with the same problem... My was mounted on my bike and if you look at the sample video you'll see how shitty it is... I think it's not just CMOS/CCD and shutter issue... I think it also has to do with optical image stabilization... I just decided to buy second camera not HD like I used in the Unleashed video as it did a great job... Will find out from my friend which model it was and post it :D

How would the HDC-HS9 operate in this environment?

If you want a camera just for HPDE events take a look at the $150 Aiptek HD+. I added a wide angle lens and even though my mount still has a little shake the picture turns out decent. The BIG downside to this camera is the sound - alot of wind noise. However, there is a mod I found online that shows how to solder in an external mic jack. Then I took a lavalier mic and put it in a film container and stuffed acoustical foam around it and mounted it near my license plate. No wind noise and you get the exhaust noise loud and clear.

This clip is before the external mic mod...
vimeo.com/1497652

Oh, and for the record my NSX is running 1000 lb springs front and 800 lb rear so it's not a "soft" suspension by any means!

Here is another video post processing with iStabilizer
vimeo.com/1680400

I'd like to see the sd9 footage. I thought because it was CCD it would be better.

You should post it too.

camera and vw pron all in one... LOVE IT... too bad about the cam, but I can't see myself doing too much of this.

btw looks like the SD9 holds up better with OIS off
vimeo.com/1655661

Starting to lock it in for me, hate to say it sony. I wonder if turning off image stabilization on the HF10/HF100 will do the same

The main problem is failing to isolate the cam from vehicle vibration. I've had fair luck with jamming a small tripod on the floor between the edge of the seat and the dash (passenger side) with a piece of compressed foam between the front leg and the other two legs against the seat.

I heard of others doing the same thing but with a thick piece of foam on the floor between the floor carpet and the tripod feet.

My footage was not race footage but some of our city srreets intoduce plenty of vibration from rough pavement.

Cam was HF100...All HD will have some degree of problem with movement.