I have to agree with Portuguese. It's not just Brazil (where I'm currently miserable at), but also places like Angola, Mozambique and such. A lot of Portuguese people are leaving Portugal for Angola - I kid you not! Spent time there last year.Asia will come up. Apart from Mandarin, you might want to think about Malay (Bahasa) and Hindi.With languages that don't use ABC, it's best to just learn the spoken bit first. Here's an example. In China, they use simplified Chinese. Compare this to HK. I can't read or write (apart from the first character), but can speak both Mandarin and Cantonese.Malay (Bahasa Malaysia or Bahasa Indonesia) uses ABC. Fairly easy to learn. It's a good way to get into these other languages, in terms of how to pronounce things in a way that's different from what we're used to in English. Plus, because it borrows from other languages, you also learn words in, say Hindi. For example, "dunia" means world. It's a Malay word. It's also a Hindi word. This is a fast-growing region.I would then say..... Italian. I feel that it's the closest to Latin. And many similar words to Spanish/Portuguese. It may differ a bit (e.g. mondo and mundo) or pronunciation (e.g. certamente and ciertamente, cento and centos). But I concur with the Evil Consultant. It won't make much of a difference in Europe. But it will outside of Europe.