This one looks pretty good so far:Morgue File
Where photo reference lives.
Public image archive for creatives by creatives
Free images for your inspiration, reference and use in your creative work, be it commercial or not!
Wondering about the morgueFile license? Click here
It's also easy to add your own photos to the morgueFile. So, give back because this archive is for creatives by creatives.
http://www.morguefile.com/