www.cloudbirders.com/tripreport  -  1000's of trip reports worldwide

www.fco.gov.uk/travel/countryadvice.asp  -  worldwide travel warnings etc. from the UK government

www.landenkompas.nl - algemene reisinfo per land

www.earthcalendar.net  -  dates (to avoid for trips?) of all official holidays (celebrations) for all countries

www.worldclimate.com/climate  -  climate statistics worldwide (average rainfall and temperature)

www.worldweather.org - official weather forecasts and climate statistics of many countries

http://www.cpc.ncep.noaa.gov/products/analysis_monitoring/regional_monitoring/  -  weather of the past months

http://www.gaisma.com/en/dir/001-continent.html - sunrise/sunset-graphs + tables with precipitation etc.. - for many world cities

www.timeanddate.com/worldclock  -  present time allover the world, handy when phoning overseas

www.gocurrency.com/ -  a universal currency converter, with 5 weeks history
www.exchange-rates.org - with currency abbreviations

www.jvanderw.nl/tips.html  -  review of tip (gratuities/fooien) habits across the world

www.tiscali.co.uk/reference/phrases/spanish/data/telephone.html  -  phone phrases in Spanish. Abbreviated version, also for French and German: http://johnbirding.wolweb.nl/phonephrases.doc 

www.world-airport-codes.com  -  airport codes (plus GPS location), also of smaller airports

www.amadeus.net  -  a universal flight planner

www.avis.com, www.sixt.com  -  to get an idea about the cost of a rental car including insurances etc.

www.jvanderw.nl/generalhints.html  -  general hints for birding in (mainly) South America  

http://www.sofasandsectionals.com/bird-watching-guide  -  a beginner's guide to birdwatching and birding, with several useful tips for advanced birders too

www.amazon.com (use Search), 
www.nhbs.com (>Zoology> Birds) and
http://www.birdingworld.co.uk/  -  catalogues for bird books worldwide 

www.xeno-canto.org  -  a vast collection of bird sounds, first from Central en South America and now worldwide

http://www.birding2asia.com/W2W/freeBirdSounds.html  -  several sounds from Asia

http://avocet.zoology.msu.edu/ - large worldwide sound collection of Michigan State University

www.birdsounds.nl  -  shop for cd's/dvd's of sounds

http://aviandiscography.webs.com/discography.htm -  a huge catalogue for bird sounds on cd's, websites etc. 

www.worldbirdnames.org - the IOC world bird list, including link (at bottom) to combined excel of IOC+Clements

http://www.knutas.com/birdsearch/ - translation tool for Western Palearctic bird names

www.protectedplanet.net - protected areas all over the world

www.worldtwitch.com  -  twitch site for world birders

www.surfbirds.com  -  info, reports, rankings of world and regional birders, and entries to email groups worldwide

www.fatbirder.com  -  a lot of info for the world birder

www.guidedbirdwatching.com - to find private bird guides

www.camacdonald.com/birding/birding.htm  -  world birding hotspots, with much related info

www.birdingonthe.net/birdmail.html  -  latest mails of birding email groups (mainly N Am.)
www.birdingonthe.net/mailinglists/holzmanarchives.html  -  searchable archives of these email groups

http://listserv.arizona.edu/archives/birdchat.html  -  archives of BirdChat e-mail group (with some trip reports)

http://groups.yahoo.com/group/orientalbirding  -  archives of Oriental Birding e-mail group (tips about sites etc.)

http://birdinginasia.blogspot.com/  -  Susan Myers' trip reports Asia

www.birding2asia.com - detailed site info for some Asian countries

www.birdingtheamericas.com  -  Blake Maybank's collection of trip reports from North/Central/South America

www.birdtours.co.uk  -  a  collection of trip reports worldwide

www.cloudbirders.com/tripreport  -  1000's of trip reports worldwide (the successor of travellingbirder.com)