Mirrorless users may find these other Web sites of interest. I've organized them by mount in alphabetical order (other than the other generic sites I list first):
Generic:
Fujifilm:
Fujifilm M-Mount Adapter Lens Compatibility
Fujifilm's X Photographers Gallery
Nikon 1:
m4/3:
Four Thirds official site (also Micro Four Thirds, or m4/3)
4/3 Rumors (rumor site for m4/3 equipment)
Olympus Lens Updates for Panasonic Bodies
Sigma Lens Updates for Panasonic Bodies
Ricoh:
Samsung:
Sony:
Play Memories Apps Site (NEX-5R, NEX-6)
Other: