Does anyone know how much it has sold? WW ? US?

I wish I knew for the US. In Japan, it's probably @ 20,000 or so. It didn't do too well there, despite it being an absolutely fantastic game. One of the best co-operative experiences in gaming history.

It was released March 20th, yet I can't find it anywhere on the charts. I really doubt the game would of sold less then 2,000 copies in it's first week. Also the game wasn't released everywhere, and it's limited quantity sold out. I've been looking and was only able to purchase a copy last week. Now, I'm just waiting to find a Guitar Hero 2 copy somewhere (rumour is that Canada will have to wait to June for a new shipment)

Who would of thought that a game about giant spiders, giants ants, and towering robots destroying Tokyo wouldn't do good in Japan??

The PS2 version of the game did fairly well. I believe it sold around 20k units or so. It's a truely niche title, and had absolutely no marketing. In the US, I believe most game stores got a few copies for renting. I assume that Gamefly, Blockbuster and such got 10,000 copies alone.