I think the biggest surprise of the week was a previously unannounced Tingle application. It includes a calculator and some other stuff. There was no mention of the before it showed up in the Japanese DSiWare Shop, I didn't list it since it's an application suite and not a game.
I was surprised that Dragon Quest Wars came out so soon too, hopefully that means we get it by the end of summer (being made by Intelligent Systems gives me hope that it is good).