Here is the collection of some very useful links:

Oanda - Currency converter for 164 currencies.This link is going straight to the converter but there is more useful information on the site.You can even trade currencies(not really my type of game) but the information is free.

DistanceFromTo - The name says it all.Very simple page and it's really all that you need if you want to know the distance between two places.

GuideGecko - This is a guide shop.It's not free but it's fairly cheap and you can buy guidebooks as book or PDF download.I can't discuss quality of guidebooks because i haven't buy anything there yet so if any of you do that before i do please post your comment in the forum.