Organized reference of military aircraft, small arms, etc.
http://www.militaryfactory.com
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Blueprtints of aircrafts for "anatomy" study of aircraft.
http://aviationshoppe.com
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Interesting color related tool. One tool lets you choose up to 5 colors, and the collage wall on the left will auto select photos from Flikr that fit your color theme. Another tool lets you upload an image and it will pick out a selective palette for you based on that image.
http://labs.tineye.com
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Large photo collection of birds, along with other nature related themes.
http://mydigitalmind.deviantart.com/gallery
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