Latin is great for learning nearly all Indo-European languages including Spanish, French, German, English(a butchery of all languages mutated together), etc. I'm not sure how closely Swedish and Norwegian relate to Latin but I'm sure Chruser can point out any similarities or differences.
I know Latin can't help with Asian languages, but I haven't found Japanese to be all that hard. Introducing myself is as far as I am right now, but it just rolls off my tongue as if I were a Jap myself ~_~