I'm obviously fluent in Swedish, but I consider myself almost as fluent in English thanks to the fact that we are taught English from like first grade in Sweden and then are constantly bombarded by it in various media.
In fact I frequently find myself actually forgetting that I'm even listening to a foreign language.

I have a few random skills in lots of other languages, well enough to at least be able to understand easier sentences;
Spanish and German are manageable, although I do have to look up words quite frequently.
I have also done amateur studies on Russian, and know enough Japanese to be able to follow game scripts with a 30% literacy or so.

Next up is most likely Greek, since I was on Crete last week and impressed the Greeks with my reading skillz (largely thanks to my interest in math and physics, subjects which tend to use Greek letters to represent all kinds of things).