http://www.ex-500.com - this website absolutely rocks! The forum members are amazing and there is everything you could ever want to know about owning/repairing/modifying the GPZ500S (EX500).
http://mfes.com/wade/ex500.html - this is a good start point for someone owning or planning to own a GPZ500S.
http://www.stevemorley.com/ex500/ - another EX500 owner's page
http://autos.groups.yahoo.com/group/gpzowners/ - a Yahoo Group for GPZ owners. Not as good as ex-500.com but useful as a last resort.http://www.ex-500.com/index.php/topic,4158.0.html - a thread listing my mods on the ex-500.com website.
http://en.wikipedia.org/wiki/Kawasaki_Ninja_500R - the wikipedia page with lots of details and history on the EX500
http://www.bikez.com/motorcycles/kawasaki_gpz_500_s_2002.php - specifications on the GPZ500S (good for comparisons etc)
http://www.answers.com/topic/kawasaki-ninja-500r - another summary of the EX500 (Ninja 500R - the R makes it "faster")
http://www.ciao.co.uk/Reviews/Kawasaki_GPZ500s__81867 - several reviews of the GPZ500S
http://www.fz6-forum.com - an excellent forum for FZ6 owners with mods, help and advice
http://www.sportbikes.net/forums/fz6/ - the FZ6 section on one of the most popular bike forums
http://www.foc-u.co.uk - a UK-based Fazer owners club - this is mainly biased towards the older style Fazer (FZ600)
http://www.bikez.com/motorcycles/yamaha_fz6_fazer_s2_abs_2008.php - specfications on the Yamaha Fazer FZ6
http://www.yamaha-motor.co.uk/products/motorcycles/fz_series/fz6a-s2_fazer.jsp - the official UK Yamaha page on the FZ6 Fazer
http://spreadsheets.google.com/pub?key=pEl7ykroxczRgHdiZ86mULA - a nice comparison list of which parts from other bikes fit the FZ6
http://members.shaw.ca/fazed/mods.htm - a nice 2004 FZ6 owner's page with lots of details on his bike and mods he's done
http://www.mandp.co.uk - one of the best sites I've found for buying motorcycle bits, well worth ringing them up as you sometimes get discounts! Excellent prices, postage and customer services
http://www.busters-accessories.co.uk - actually owned by the same guy who owns M&P and they usually have the same prices
http://www.inter-bike.co.uk - another good website to buy bits from
http://www.intobikes.co.uk - another good website to buy bits from
http://www.clarity.net/~adam/hurt-report.html - a good report for anyone to read who rides about the dangers we face
http://www.webbikeworld.com - an amazing website for any motorcycle owner - especially for things like helmet reviews
http://www.parkingforbikes.com - a great site for those who like to park their bikes for free!
http://www.torquecars.com/tools/uk-mpg-calculator.php - useful in working out how much fuel you're burning.
http://www.totalmotorcycle.com/dictionary/NUMBER.htm - an invaluable resource for anyone new to biking
http://www.mozilla-europe.org/en/firefox/ - the best web-browser out there. Download it and play around with all the themes and extensions
http://www.gbpvr.com - absolutely brilliant and free PVR software for those of you who have a TV card in your PC (I have 2)
http://azureus.sourceforge.net - the best Bittorrent client out there
http://www.gimp.org - not quite as good as Photoshop - but it's close and completely freeware!
http://www.rarlab.com - a truly excellent piece of compression/decompression software. It opens everything!
http://www.photobucket.com - one of the best image hosting sites out there and the one I use for all my image files
https://www.copilot.com - very useful if you have an annoying relative with computer problems and an Internet connection
http://www.ukfree.tv/transmitters.php - good if you need to find out which freeview transmitter is closest to you and it's position
http://www.imserba.com/wapupload/ - good if you need to get a file onto your mobile phone and don't have Bluetooth or a cable
http://virusscan.jotti.org - if you have a file you're unsure of, use this site to check it with lots of different virus scanners
http://virscan.org - if you have a file you're unsure of, use this site to check it with lots of different virus scanners
http://windizupdate.com/ - use Windows but hate IE? With this site you can still use Windows Update!
http://www.xbox-scene.com - a great site for Xbox owners (new and old) who want to chip/modify their console
http://t3ch.yi.se - builds of the most amazing piece of software ever made for the Xbox (XBMC)
http://astalavista.box.sk - a very useful website for all sorts security/crack-related things - if you don't know what a crack is, avoid it!