The following are the formations used by the teams for most of 
    their snaps.

Arizona         FPRO    46      Atlanta         SHOOT   4-3
Buffalo         ONEBACK 3-4     Chicago         FPRO    4-3
Cinncinati      FPRO    4-3     Cleveland       FPRO    4-3
Dallas          IPRO    4-3     Denver          PRO     4-3 
Detroit         ONEBACK 3-4     Green Bay       FPRO    4-3
Indianapolis    FPRO    4-3     Kansas City     FPRO    4-3
LA Raiders      FPRO    4-3     LA Rams         PRO     4-3
Miami           FPRO    4-3     Minnesota       FPRO    4-3 
NY Giants       FPRO    3-4     NY Jets         FPRO    4-3
New England     FPRO    3-4     New Orleans     FPRO    3-4
Philadelphia    FPRO    4-3     Pittsburgh      FPRO    3-4
San Diego       FPRO    4-3     San Francisco   FPRO    4-3
Seattle         FPRO    4-3     Tampa Bay       FPRO    4-3
Washington      FPRO    4-3     Houston         SHOOT   46

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FPRO - Fullback in Pro Set              3-4  3-4 Defense
DBLWNG - 2 TE's, 2 WR's, 1 RB           4-3  4-3 Defense
ONEBACK - 3 WR's, 1 TE, 1 RB            46   46 Defense
SHOOT - 4 WR's, 1 RB                    
IPRO - I Formation
PRO - 2 RB's in Pro Set


*  Minnesota can go One Back because Moon can be more effective that way, 
    but they use a Pro Set often also.
*  Denver also goes One Back because of Miller and Pritchard, but can use
    Pro Set often as well.
*  Buffalo might switch to a 4-3. Also wants to go FPRO but Carwell Gardner
    is not a fullback that can be counted on (fumbles in pre-season).
*  San Francisco also uses One Back quite often.
*  Houston uses H-Backs and a Pro Set and a One Back in the red zone as well
    as 8-15% of their plays.
*  Dallas also uses One Back occasionally.
*  Detroit can use Pro Set.
*  LA Raiders can go One Back at times (seems like No back!)

It is best to make custon game plans to exploit a teams strengths, but also
to get accurate performance from players.