I keep coming back to Flickr. The latest thing Ive noticed is how sharp the albums present themselves. Lots of touches like this along with a deep-as complex as you want it to be-organization system make it unique. I signed up for Pro program even though Im not, and it has proved invaluable for me. Well worth it especially if you are sharing photos with family and friends and dont want them to have the bother with sign ups and login ins. User friendly.
Miles From Now about Flickr, v4.3.0