Which language(s) do you currently speak? If you could learn only one other language, what would you choose, and why?
German is my mother tongue, and I'm fairly fluent in English. I also study Russian and Irish-Gaelic, but I'd probably never be able to survive with my respective language skills in these languages in a foreign country..
I absolutely want to study Icelandic and Bulgarian one day. Icelandic is an incredibly interesting language, sounds great and has a funny looking alphabet, and what with the purity thing and the translating of any new term instead of simply borrowing the words from other languages.. awesome. Well, and my aunt is from Bulgaria, plus I simply love the East-/South-Slavic languages, so there you go.
Swedish might be nice one day, too - all the Northern languages have such a nice sound to them.