5 Stock Time Bombs: "Wherever your investing preferences may take you, I encourage you -- no, beseech you -- to acquaint yourself with the factors generally accepted by the value investment community as sustaining a stock's long-term value."—The Motley Fool

To save you a click, the list includes Google, Travelzoo, Medimmune, and Computer Assciates. It also includes Taser, but with an upside prediction. Travelzoo, trading at 373 times earnings, is the newest addition to the Bubble 2.0 Index.