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!
For those not encumbered with laptops, you can't beat ye olde book. And Amazon is still one of the best value bookshops on the web. Search here (or just click to go to Amazon):