Interestingly enough I just got a letter asking me to get the front suspension repaired under what looks like a recall, but probably is more like a "customer satisfaction campaign".
I talked to the dealer and they got a huge shipment of parts for this, so they can deal with the G8s that are affected. Here's the first paragraph.
We have learned that your 2009 model year Pontiac G8 may have a condition that we would like to repair before the extreme cold temperatures arrive. The sealing boots on the front suspension lower control arm ball joints may not seal correctly in extreme cold temperatures. The material of the boot may become rigid in cold temperatures and could allow contaminants to enter the boot. This could cause premature wear of the ball joint, which could result in a clunking or rattling noise when the vehicle is driven over rough roads, wheels out of alignment, and/or premature tire wear.
Of note is that this will be done at no charge only until Nov. 1st, 2009. So they really want those G8s in and fixed. I guess they finally found the problem with the clunking suspensions. And I guess "cold weather testing" in Australia didn't cut it .
This was from GM Canada. I wonder if a similar campaign is happening in the US? I hope this addresses some of the folks who had problems with their G8's front suspensions.