Full-body, digitally illustrated, anatomy diagram. First grouping is by system - skeleton, muscle, digestive, nervous, etc. Each system is then further divided into subgroups, then again into sub-parts. This collection of diagrams go as detail as tooth and nails.
http://www.innerbody.com
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Image diagram tutorial on how to draw human figure, expression, and animals.
http://majnouna.com/tutorials.html
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Reference photo, man mostly, various costumes from military to fantasy to birthday suit. Cross-dressing galleries.
http://manstock.deviantart.com/gallery
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Scroll down to see pictorial manuals for various martial art on whole body pose, arm position, lower body stance, and finger forms.
http://www.pinterest.com/peachymini/anatomy-and-character-poses
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Organized reference of military aircraft, small arms, etc.
http://www.militaryfactory.com
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Mostly female pose reference in fantasy-ish and steam punk costumes. Some nude or near-nude.
http://mjranum-stock.deviantart.com/gallery
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Large photo collection of birds, along with other nature related themes.
http://mydigitalmind.deviantart.com/gallery
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Photo collection of hairstyles, grouped by length, gender, and special occasion.
http://www.hairfinder.com/hairstyles_pictures.htm
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Library of information mostly related to 3D artist in game industry.
http://wiki.polycount.com
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Video references of fighting, facial expression, men, women, children, animal moving, etc...
http://www.referencereference.com
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