Flickr (http://www.flickr.com)
Its blog: http://blog.flickr.com Favior Reason: 1. tag support, clear GUI and support for photo blog with most of famous blogs, notes on photo; 2. amazing organizr software; 3. group photo pool, mobile version...

Webshots (http://www.webshots.com)
One of the interesting function that webshots outperforms Flicks is its offer of photo gift. You can prepare gift (mug with photo you kiss her) for your girlfriend.
Similar function is also provided by a chinese site (http://www.dotcolor.com/)

Tabblo (http://www.tabblo.com)
I found this site because my Nikon s7c. Different from Flickr and Webshots, this site realizes that only the collection of all photos about a topic is useful and attractive for viewers.

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