Cleveland Browns head coach Romeo Crennel was among those who spoke at the NFL Rookie Symposium on Monday.  Crennel was among those speaking to the 2007 rookie class about the league’s stricter rules when it comes to off-the-field conduct.  The symposium is also held to help the newest members of the NFL learn how to deal with finances and how to prepare for life after football.  The symposium will run through Wednesday.