Imgur is a super-simple photo-sharing site that you can use to upload photos or insert image url addresses. It can come in particularly handy in the classroom because of it’s ease in creating albums where you can title individual photos and write captions — all without registering. Students can categorize photos and describe them.
I learned about it through a Read Write Web post, which compares Imgur negatively to another new site, but I find Imgur far superior.
I don’t have a “The Best…” list yet where Imgur would fit in exactly but, because I would use it primarily for students to categorize and describe photos, I’m going to add it (for now) to The Best Social Bookmarking Applications For English Language Learners & Other Students. Other apps on that list have a similar categorization feature for images.