There are a hundred, if not thousands of Aikido video clips on sites like YouTube. I thought it would be a good idea to ask everyone to post a link to their favourites.
Here, in a blatantly self-promotional way, is my humble contribution. Aikido clips.
Also worth checking out are http://www.youtube.com/watch?v=2TLz5GayVdU apart from the last scene which I think is hapkido.
Another good demo is this one by Tony Yates http://www.youtube.com/watch?v=aicHsMC6rxM&feature=related
Feel free to add your favourites!