Java Zoop - Online Java implementation of Zoop, without instructions. - http://joel.spolsky.com/zoop/
GameSpot - Rated 7.0/10 by Ron Dulin. "Once you do break through the initial frustration, Zoop will gradually become an addiction." Reader reviews. 5 screen shots. - http://www.gamespot.com/pc/puzzle/zoop/
Wikipedia: Zoop - Encyclopedia article on Zoop. - http://en.wikipedia.org/wiki/Zoop