Taken from the old thread and made sticky:
Erowid - Extremely useful website for research and non-biased information.
Urban 75 - A bit of a crappy site, but it has one or two useful bits of information.
Coffeesh0p - Synchronium's legal highs shop, with forums, articles, link directory, etc.
EveryOneDoesIt - Brilliant shopping site that even includes some videos on rolling e.t.c.
La Boheme - Nice site for all your Absinthe needs.
Absinthe and Absinthe Accessories - As above, nice Absinthe resource.
Cannabis Culture - Great international resource conatining news and events relevant to the cannabis smoking world.
Pot TV - Nice videos on this site.
From
Genem:
The Shroomery - For all your Shrooming needs, an intelligent site with good info.
From
Kaos-Theory:
Marijuana Pictures and Marijuana Growing at GrowKind.com - Marijuana Cultivation Forum and FAQ - growing forums
UK420.com - The Cannabis Community - growing forums
From
Wendle T. Wolf:
The Hawks eye - Good site for pics and spore ordering.
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REMEMBER:
Please post only links that contain relevant and useful information.
Post only links to non-biased sites, that contain proven facts.
If providing a link to a site that is only useful for, i.e. members of the UK, please specify.