A while back I read a book called "Ravens In Winter" and found the lives of crows and ravens to be very interesting. The book describes how they communicate food sources to one another through some type of unknown mechanism and their general high intelligence level.
When I was in Norway I came across a Carrion Crow (or at least I think it is; I looked it up on wikipedia) that found a clam-shell container that usually contains take out food. The crow obviously knew that it was correlated with food and poked it with its beak and shook it about deliberately before throwing it to the ground in disgust. I took a video and uploaded it and you can see it in HD here which I find very humorous.
Before 9/11 I traveled to Tasmania and had an encounter with what I believe was a Forest Raven, although once again I am not an ornithologist. The bird was AMAZINGLY persistent - when our car pulled up to a clearing it jumped on the side mirror (the window was open) and looked me right in the face (with big yellow eyes) and started cawing for food. I rolled up the window and it sat right on the hood of the car staring at me through the dashboard. I have never seen an (ostensibly wild) bird so unafraid of humans.
Cross posted at Chicago Boyz