aol caches things on your behalf. Blame them.
hotlinking is when people see an image of the day, and say, hey, that's really cool, I'll show all my blog readers (or whatever) the same image... by linking to it directly on cellar.org, that way the Cellar takes the bandwidth charges.
For example, the last image on this thread is actually coming from cellar.org
http://forums.somethingawful.com/sho...readid=2412841