+1 here. Add me to this list. I took delivery of my 535i M-Sport on 10-22-10 and noticed this problem with in two days. My car hasn't had any other problems or been in the shop since I took delivery.

I first noticed this when maneuvering in a parking garage, thus driving slow and turning. It is definitely a grinding noise and it can be felt as though it is underneath the car. I can only duplicate it at slow speed when turning, more so when beginning to accelerate out of a turn. Its nothing I believe in the steering wheel as I don't feel it through there. All passengers in the car notice this as it can be felt through out the car. The best way I can describe it to some feeling is that if anyone has or has ever ridden a Segway too fast, the "stick shake" warning you get, that's it.

I want to contact my dealer this week, but I want to get some more info first if possible. I know there have to bee many others out there. It cant be just Soltice and I.

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2011 535i M-Sport (Delivered 10.22.10)
2008 X5 4.8
2001 330i
1999 323i