Flickr is the best I have used, again mainly because its so easy to use!
as for camera phones being of the same quality as normal cameras, its not how many megapixels neccesarily, more the physical size of the sensor and the quality of the lens used, because of this camera phones aren't quite as good as modern compact cameras yet. Thats not to say they are rubbish or no good, I am constantly impressed by the picture quality of my samsung tocco, but when i compare it to some of my other cameras it doesn't quite stack up.