I had my rear shock replaced at one month of ownership (300 miles) for the same reason. I had to find it for the dealer (you know, the "we can't hear it" game...). I opened the trunk with the car off and put a little weight on the rear passenger side - wallllllaaaa! Click click click - pissing me off click click.....
They replaced the shock under warranty. That was 2500 miles ago - not a peep since.
Looks like Honda got a bad batch of these. My car is a 2008 EX Coupe (atomic blue - the fastest color).
