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This is a list of links to helpful (IMO) miniature/terrain painting/basing/modeling/converting tutorials.
These tutorials are usually not Infinity based but offer something that can be used for Infinity... or just to improve your painting/modeling skills.
You're welcome to add your tutorial links (only links, maybe with a short description - images will be deleted!), but be aware that they may be incorporated into the main list
So, without further ado:
PAINTING
Painting OSL (object source lighting) - the basics (BrushThralls)
Painting female eyes (Reaper)
Painting female faces (jenova.dk)
Painting female faces, different article (Sintricat)
Painting fire/flames (BrushThralls)
Realistic rust effect (Tinweasel)
Painting skintones (jenova.dk)
Sponge-painting battle damage/chipped paint (Grey Death)
Painting leather quickly (Ariadna?) (FromTheWarp)
How to make a "wet palette" (MassiveVoodoo)
Les Bursley's awesome wash recipes (AwesomePaintjob)
Painting very expressive gold and silver (BoLS)
Build your own painting station (Dakka)
What is glaze medium and why you should drink it every day* (* Note: Do not actually drink glaze medium) (BrushThralls)
Army in 7 days - most projects done on time(!), awesome source of motivation (TheNode.pl, in Polish - Google-translated link here)
BASING
Basing: Plants and Vegetation (NecroTales)
Back to bases 1 - sculpting textures (BrushThralls)
Back to bases 2 - cork and snow (BrushThralls)
Back to bases 3 - cracked eath/weird mosaic (BrushThralls)
Cork basing (The Painting Corps)
Basing in a hurry - using what's on hand (J. Wappel)
Hordes basing: from the ground up (forest/swamp, winter, badlands) (BrushThralls)
Forest/swamp/winter bases (Salmondworks)
Thick snow basing (BoLS)
MODELING
Easy hexagon scale pattern sculpting (Bolter&Ch.)
What is the Oyumaru Modeling Compound? (an awesome thing for duplicating details/conversion, a.k.a. Instant Mold) (Youtube video)
Improving weapons with brass rod (for deployables/antennas/polearms) (Salmondworks)
Greenstuff icon molds (Oyumaru works better for this) (SWCHQ)
Sculpting details from Green Stuff - Tabards, chains, hair etc. (Dakka)
Homemade foamcore rabbet cutter (cut beveled edges in FC) (TerraGenesis)
Resin casting in silicone mold (Ultrawerke) (5 parts)
Scratchbuilding vehicles from plasticard (Ultrawerke) (5 parts)
Making sand-cast foam terrain (Reaper)
Making scenic water bases (drown your Cutter) (Reaper)
Making wargaming craters that don't suck (3T Studios)
Building armatures for polymer clay sculpture (Squidoo)
CONVERTING
Greenstuff disguising joints with cloth/fur (BrushThralls)
Pinning (BrushThralls)
Sculpting 101: Basics (BrushThralls)
Sculpting 102: Fixing joints (BrushThralls)
Sculpting chains (Dakka)
PHOTOGRAPHY
Homemade light box for product photography (Studio Lighting)
How to make an inexpensive light tent – DIY (Digital Photography School)
SUPPLIES
Oyumaru Modeling Compound (Ebay)
W&N7 Kolinsky sable round brushes (Dickblick)
W&N Kolinsky sable miniature brushes (Dickblick)
Hirst arts - cast terrain and molds (they have SF too, awesome for Nomad boarding action!)
Armorcast - resin(?) scenic effect for conversion (muzzle flashes, flames, smoke etc.)