I've also just noticed this issue too in my 2010 Presara (Delivered Oct 2010). Seems to creak when I accelerate, and is most obvious from standstill (eg at a set of traffic lights) and when I brake, whether it be slowing down for a turn, or coming to a halt. I've only noticed it only on warm days though. When it's cool, or at night, I don't recall noticing any creaking. Will get the service tech @ Toyota to take a look at it and fix it at the next service which is still a fair way off unfortunately. In any event, it should be covered under warranty, together with the odd soft clunking I'm hearing from the front end (steering rack?) when I go over brick paving, or over cracks on the road. I guess it's to be expected, considering its age. Soon it will be time to retire and replace the Aurion. It's been a very comfortable and reliable car to date!