i am in love with flickr. ive been using it now for a few months to put some pictures there. whenever a picture is uploaded, there is an option to put a tag to it. so for example i uploaded some pics from last nights fourtet concert with the “fourtet” tag (as many tags as you want can be used per picture). this allows pictures to be easily sorted through. (on the side of most pages there is a option to see the pics in a slideshow format too and clicking on the other link allows you to see all pictures by everybody on flickr that has the same tag). anyway, give it a go if you havent already (note: there is a free version and a pro version, here is some info about the difference)

the tags listed here are the most popular ones from me, the larger the word, the more pics i have uploaded.