They're right. This is absolutely fascinating.

Blogger just put up Blogger Play [Now, alas, defunct], a feed of all the photographs people are uploading to their blogs.

Flickr has had a similar feature for a while now, but not as a slide show. Watching the pictures flow by has a completely different feel. I won't even try to summarize or describe it here. Just chase the link (and prepare to lose a chunk of time).