To correct people to the name, and the fact that it is referred to legos so much that Lego bought that domain name as well to redirect people back to lego. There is no plural form, it's just Lego, the name of a singular entity. I wouldn't say that I have a box full of Lego, I would say that I have a box full of Lego bricks.
And you would be wrongto do so. As LEGO themselves point out. I don't know exactly why America has a problem with this.
i actually thought the same thing... anyway, this is awesome. i want to build a house from lego... as soon as i become an eccentric billionaire that is.