Heisman Trophy Curse?

I'm sure many of you know by now that most people who win the Heisman Trophy in college go on to do poorly in the NFL. Some people, including the first Heisman Trophy winner and first player ever drafted Jay Berwanger, never even played. Of the 71 Heisman Trophy winners only 8 of them had really good careers in the NFL. How do you think recent Heisman Trophy winners will do in the NFL such as Carson Palmer, Matt Leinart, Reggie Bush, Troy Smith and eventually Tim Tebow? Also, I counted only 8 players that won the Heisman that had good NFL careers. Are there more than that and if so who?