Hello,
I have submitted Android version of our game to Amazon about 10 days ago (14th) and it's still in review. I know they have checked it out on multiple devices (thanks to flurry) last week but there were no activity since...
I know they were a bit slow (specially at the appstore launch) and upcoming kindle fire might also have some effect.
So, if you have apps there can you please post what was the average approval/rejection time for you?