Some of my favourite Links:

80 Series:
i8hmud.com - very active forum - mostly US. Many Land Cruiser specific technical articles.
80 Series Cool - The original definitive 80 series web site, join the mailing lists (not very active) via this link

Tyres:
Goodyear - MTR
Interco - Swampers etc

Stuff:
Westmarine - on-line marine store - lots of good stuff (battery isolators etc)
Waytekwire - great prices for dielectric grease and adhesive lined heat shrink tubing
Mechanical Man - lots of nice gear for auxiliary batteries etc - does good work
McMaster - hardware bits
White LEDS -  cheap decent white LEDs - funky site, but the guy selling is honest
White LEDS - another source - more variety, they have Luxeon LEDS too - VERY $BRIGHT

GPS/Navigation (mostly Garmin related):
http://www.gpsdiscount.com/ - great prices & service for GPS hardware
Oziexplorer - mapping for the PC - use your own maps (Highly recommended)
GPS Pilot - mapping for Palm devices - use your own maps
Marcosoft - US street level mapping for Palm devices (GPS support) - neat
Mapopolis - US street level mapping for Palm devices (GPS support) - was free
Waypoint management for Palm devices - FREE!
Shareware connectors for your Garmin
Peter Bennett's great GPS resource homepage
Online Geographic Names - Australian place names

Miscellaneous (mostly oz stuff):
What time is it there? - internet based world time
West Australian Newspaper online
Radio Australia audio on the Internet - listen to Radio Australia on your computer
Weather in oz - Government site - lot's of weather stuff for all of oz
Real time Weather in oz - download a neat toolbar app for windoze (Weather Stats)
What's the oz $banana worth - exchange rates for the oz$

Home pages etc:
http://www.southwest.com.au/~ickbars/ Mick Barson
http://home.off-road.com/~cruiserhead/ Jim Brantley

4wd gear (companies):

http://www.sleeoffroad.com Christo Slee - great guy
http://www.sierratoy.com toyota spare parts - John Hocker john_hocker@sierratoy.com - all round good guy
http://www.rockstomper.com Good prices on Synthetic winch ropes etc
http://www.bigballsoffroad.com Liam Quigley