I'm not exactly a Flickr power user -- I've never left a photo note, though I've read lots of them. On Flickr, when a photo note is made, the user specifies a zone of the photo and types in a comment. The zone is then marked on the photo with a little box. Mousing over the box shows the note. Okay, simple enough. But what happens when users add 271 notes to a Flickr photo? Sheer madness:

Uploaded on July 4, 2006 by Andrew Castellano, the photo is entitled When Waves Collide. The image shows waves crashing together just off Laguna Beach in California -- but it's a bit hard to see with all those notes. The photo has been marked as a favorite 5,141 times, it has been viewed 375,884 times, and in addition to the 271 notes there are 1,339 comments from other users. Wow.

For more excellent photos from Andrew Castellano, check out his photo stream.

(Via Kottke.org.)