First useful thing to appear on this page is a currency converter, which can be found at: http://www.xe.com/ucc/
If you travel a lot, have you thought about eBooks? If you have a computer or palm pilot with you anyway, using eBooks will save a lot of baggage allowance and space. For a good selection, see:
Free Online Dictionaries in the following languages - Afrikaans, Danish, Dutch, Finnish, French, Hungarian, Indonesian, Italian, Japanese, Latin, Norwegian, Portuguese, Russian, Spanish, Swahili, Swedish - available here: http://freedict.com/
And if you can't find it above, there are dictionaries for an astounding 300 languages here: http://www.yourdictionary.com/languages.html
I doubt i can top that, so that's enough dictionaries!