Flickr Camera Roll
Flickr is the best tool for backing up photos. The one of Flickr's problems is, it's very difficult to view overall photos. When I would like to find them without searching, I have to click each page. It takes time so much. I just see that Flickr releases Camera Roll. I love this feature so much because I can view overall photos with small thumbnail. So I can find photos quickly.
I have not seen new feature for long time. I hope flickr will release many features later.