Two blogs in one

I want to have two (or three) blogs in one. The thing is, I have one blog in English, and one in Norwegian, and I’d like to have them in the same database on the same site, but being able to show the posts in English only on default, and filter the Norwegian ones on a page or something. This is probably very easy, but I’ve lost the last of my l33t stuff in me.

Please, help an ex-nerd =)