A store has a stack of PS3's = Sony is stuffing the channel. Anecdotal evidence is so much fun! 
Stores around here have piles of every console and bundle imagineable, despite massive ad campaigns, the consoles just aren't moving at a fast enough pace and many stores are resorting to 24 hours price cuts and local special offers to get rid of them. I'm not surprised that there would be more PS3's in a store in December in the US or UK; the numbers on the frontpage would suggest the same. Its actually very logical, the 360 and Wii move a lot more hardware in the US, simple as that.
A pile of PS3's in a store is not proof that Sony stuffs the channel on purpose though, it could rather be a case of companies and store chains misjudging the market and demand. Same thing recently happened here in Norway, stores bought mountains of iPad's but they're stuck with massive mounds of them on shelves since they're moving slower than anyone expected here.
