I have tried to use Flickr several times before, and everytime go back to using photobucket. I feel that for when you want to organize and use specific images on websites or forums, or download them from another computer photobucket is superior. Flickr is really good for finding and sharing random images, and is powerful in all the other sites that use it’s images to create compilations. The new layout of the photo page is a lot more user freiendly, but you are sill unable to get links from multiple images without going into each of them.
I have use flicker in class by having students find images of a concept that I have been talking about.