Here is a list of active players picked in the fourth round or later that went on to become very good players in the NFL.

Offense

QB:Tom Brady
RB:Rudi Johnson
RB:Marion Barber III
WR:Donald Driver
WR:Marques Colston
TE:Antonio Gates
RT:Mark Taucher
RG:David Diehl
C:Kevin Mawae
LG:Alan Faneca
LT:Flozel Adams

Defense
RE:Jason Taylor
DT:La'Roi Glover
DT:Grady Jackson
LE:Aaron Kampman
LB:Derrick Brooks
LB:Zach Thomas
LB:Donnie Edwards
CB:Dre' Bly
CB:Asante Samual
FS:Atari Bigby
SS:Rodney Harison