A great online/by phone used camera shop in Victoria, Camera Traders, put up a nice post about mega pixels and camera sensors. It is possible to have too much of a good thing.
But what I love best of what they are doing is their Twitter/Twitpic account. It keeps you up to date on what's coming into the shop. Better yet, they post pictures of the used gear coming in.
It's like stopping by the shop around the corner everyday to see what's new. Good job, Anthony!