Irelandseye.com has a webcam watching the room that Helena Blunden haunts. The Belfast building used to be a mill, and she died in a fall. The site encourages you to report whether or not you see anything.
Evansville, Indiana has a ghostcam as well. The Willard Library is haunted by a lady in grey. There is a chat room for people interested in the ghost.
Finally, this site has a list of ghost webcams, including the Evansville ghost and some really neat spoof pictures, the Belfast ghost, the Queen Mary, Bourbon street, South Wales, Nova Scotia, and others.