Here are some other perspective/references.
Pipeline to the NFL? Big states, schools are key - USATODAY.com
NFL draft history: Where the talent comes from - USATODAY.com
This guy seems to think that USC leads with the best talent in NFL history
Pro-football-reference.com blog Which colleges produce the most NFL talent?
Most draft picks in NFL History
It's a little too early to be calling Leinart a bust after only three years and playing the last two behind a much better Warner.