I know Div will be in here too, but I will admit to lego in just about all rooms of my house.....

I have an entire coffee table drawer chockas with Duplo in the family room
A very large lego table in the study with all my old lego from childhood (kilos of the stuff)
DS has all his (numerous) new sets in his room in a large storage crate
and DD1 has all her lego friends (all the current sets) in her room.

It's the one toy that gets played with and played with.

DD2 is even excellent with it at 19 months old. It teaches superb fine motor skills.

Even though my kids love the new sets, they actually play more with the old lego as its just in a big rolling drawer. Their imagination is able to be free.

I have a GF whose son loves lego but he and she insist that they be stored and kept in their correct sets and then only played with as the intended creation. That kind of defeats the purpose of lego as a creative medium IMO.