Clubs

European Land Cruiser Owners Club - http://www.landcruisers.info
This is a small club supported by some of the more knowledgable Land Cruiser owners in Europe. with a good bias towards overlanding.  It runs on a mailing list that takes a bit of mastering, but well worth the effort.  The club organises a number of offroading days and weekends that provide a great opportunity to meet up with other Land Cruiser owners.

Horizons Unlimited (HUBB) - http://www.horizonsunlimited.com/hubb/
This originally started as a travel site for motor bikes, but has now expanded to cover cars, 4x4s and trucks.  The site has a number of sections covering most areas of the world with excellent information on travle plans, visas, ferry crossings, offroad pistes, etc making it an ideal source for any overlander.

LCOOL - http://www.lcool.org
This is one of the oldest Land Cruiser clubs on the web and provides some useful information in the technical sections.  It is an Australian based club which has an advantage over most other clubs because the Aussies tend to cover much greater distances in the LCs soo they tend to hit age related problems (like the Big End Bearing problems) much earlier than the rest of the world.

IH8MUD - http://www.ih8mud.com
The IH8MUD forums are American based and extremely popular with a lot of traffic which can be hard to keep up with, however the Americans seem to be a lot more prepared to build their own bumpers, sliders, drawer systems and then share their work with extensive photos posted on the site so it's a great source of DIY information.

Toyota Landcruiser Owners Club (UK) - http://www.tlocuk.co.uk/
The TLOC forums cover all the Land Cruiser models with main bias tending to be towards the Green Laning side of things.  It's a popular site with most questions being answered promptly.