Excellent idea!
Okay, long list incoming! I tried to organise it already a bit on subject, might be of some help.
LotR / The Hobbit SBG gaming websites-
HdR Tabletop German site, but incredibly inspiring!
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Onyx Workshop LotR SBG fansite, with amazing terrain.
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Hour of Wolves Nice site with some LotR specific parts and articles
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La Guerra Del Anillo Spanish website, but very inspirational
Terrain Articles-
Hetairoi Wargames Blog Making water
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Gidian Gelaende Very inspirational terrain
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Terragenesis Lots of good terrain articles
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3t Studios Making rock cliffs
Painting & sculpting articles-
Element Games Various painting and sculpting articles
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Storm the Castle Making molds
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Massive Voodoo Blog Lots of excellent painting articles
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Ebob Miniatures - Sculpting Sculpting tutorials.
Terrain Manufacturers-
Dwarven Forge Modular Dwarven Mines
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Grandmanner Various resin terrain
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Ainsty Castings Fantasy terrain
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Antenociti's Workshop Terrain building
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Hirst Arts Excellent molds to make plaster building blocks for terrain
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Thomarillion Various great terrain pieces.
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Scibor Miniatures Making decorated armour.
Miniature Manufacturers-
Ebob Miniatures Excellent minis, some of which could be used for LotR (see the Dark Age, Rebellion and Fantasy ranges).
- [I could post more here, if people like]
Accessories Manufacturers-
Renedra Nice flat bases.
Tolkien related-
Thain's Book Excellent summaries of topic from Middle-earth.
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Middle-earth Xenite Excellent in-depth Middle-earth essays on a huge range of topics.