Believe it or not, it was only in the 19th century that the use of grape juice became widespread; it was not until after a pasteurization process was devised by none other than the Welch of Welch grape juice fame, coupled with the temperance movement of that time, that some churches moved away from wine in Communion.

See this article for an interesting viewpoint:

http://washingtontimes.com/upi-breaking/20050323-024611-1657r.htm

Theo