I chose to use Google's Picasa to share photos from my recent trip to New Mexico. After looking at Moodle, flickr and photobucket it looked like Picasa was going to be the easiest for me to create. I'm using my school computer so didn't have any personal pictures already loaded on it. I had my son email me photos from his telephone, downloaded to my school MAC and was then able to access them for the Picasa scrapbook!
This would be a resource I could use in my class for various introductory lessons and I'd be able to save it from year to year. There are images on the web I could draw from to create a 'glossary' of science or social studies terms with both definitions and pictures! Being able to add captions is a useful tool as well. I could potentially leave my scrapbook visible for the students on the classroom PCs so they could access them during their computer time as research tools!