flickr, I highly recommend it. I use it as my single photo storage spot, and as the primary place I use to find pictures and photographs to accompany my blog posts. And, it is the only tool on the internet that I'm actually paying for. That's how much I like it.
The photo here with this post is from one of my flickr favorites, Miss Aniela, who does some wonderful stuff, including beautiful clones. It was the clones that first caught my attention.
She is the subject of all her photographs, and she's been gaining quite a following for her artistic endeavors. Her flickr photos have even gained her a show at an art gallery!
Do check out flickr and especially Miss Aniela's photographs.