Via Michelin : find your way across the (western) world...
Lonely Planet & Rough Guides & Footprint : travel guides of choice for generations of (formerly? so called? you name it!;-) independent travellers...
Wikitravel : truly (and sometimes too much so) independent travel info, in wiki style.
SkyScanner : Cheap Flights to Europe and Worldwide
Hostel World : browse and book Hostels, B&Bs and the like...
CouchSurfing : roll the dice and find a friendly couch to crash upon all over the world!
Universal Currency Converter
weather.com : what's the weather like?
Water Temperature all over the world : will it be too cold to bathe?;-)
timeanddate.com and worldtimezone.com : what's the time?
net2phone : phoning from and to (almost) all over the world
Nets-on-Air : GSM standards used by Mobile Phone Networks worldwide
International Plugs/Sockets : a rather exhaustive illustration of various plug/socket shapes in use around the world
Electricity around the world : more in-depth info about plugs/sockets and the "vexata questio" of tension/frequency
The Xenophobe's Guides : because "forewarned is forearmed" indeed :-)