I love browsing images, especially the sort of random things people tend to post on their blogs.
There are several fun places once can go to see amazing images harvested from peoples uploads:
Flickr – the worlds most popular online image repository
Delimages – Images being linked to by De.licio.us users
Found Photos – Random images harvested from open webservers or found on memory cards (NSFW))
IRC Images – Images harvested from the IRC chat network
LiveJournal Harvester – Images harvested from the Livejournal Blogging service servers.
Also see this post on harvesting images from online image hosting services like ImageShack:
Finally, as a treat for the boys, check out one of the best uses of this technology: