Useful websites for design reference

2D

Ads of the World™ | Creative Advertising Archive & Community
http://adsoftheworld.com/

Brands of the World™ | Download vector logos and logotypes
http://www.brandsoftheworld.com/

http://psd.tutsplus.com/

http://photo.tutsplus.com/



3D

http://www.luxology.com/

http://www.3dtotal.com

http://cg.tutsplus.com/