Entering last season, the Dallas Cowboys had the highest all-time regular season winning percentage among current NFL teams.  One 6-10 season later, the team no longer holds that distinction going into 2011, but there are several historical statistics the Cowboys can achieve this season.

Of the 31 opponents that are currently in the NFL, Dallas has a winning regular season record against 22 teams.  The Cowboys all-time series is tied versus the defending Super Bowl Packers (12-12), but Dallas is 4-2 against the Packers in the postseason.

Many of the teams that have historically held an edge over the Cowboys in the regular season will not play Dallas this season.  Most Cowboys fans remember the humiliating loss against the Ravens that closed Texas Stadium.  Surprisingly, Dallas has never beaten the Ravens (0-3). 

The Cowboys have an all-time losing regular season record against the following opponents that do not play Dallas this season:

Baltimore Ravens (0-3)

Cleveland Browns (11-15)

Denver Broncos (4-6)

Jacksonville Jaguars (1-2)

Minnesota Vikings (10-11)

Oakland Raiders (4-6)

Dallas will have the opportunity to even up the all-time regular season record in Arlington against the St. Louis Rams (10-11) this season in week 7.  The teams that will give the Cowboys the opportunity to reduce the all-time regular season record advantage include:

Miami Dolphins (4-7)

San Francisco 49ers (10-14-1)

St. Louis Rams (10-11)

Remember that victory the Giants had over the Cowboys in Texas Stadium in 2007?  That was the only time the Giants and Cowboys have met in the post season.

Teams that have a post season all-time record advantage over the Cowboys include:

Arizona Cardinals (0-1)

Carolina Panthers (0-2)

Cleveland Browns (1-2)

Indianapolis Colts (0-1)

New York Giants (0-1)

Pittsburgh Steelers (1-2)

Seattle Seahawks (0-1)

Washington Redskins (0-2)

Of the teams that Dallas has played in the post season, only the Detroit Lions (1-1) and the St. Louis Rams (4-4) have won as many as those teams have lost in the all-time post season series.

Dallas is still tied with the Steelers with the most post season wins (33).  The Cowboys own the highest all-time overall winning percentage (.575), but are behind the Bears and Dolphins for the best regular season winning percentage (.578 to .576 to .575).

If Dallas finishes this season with at least an 11-5 record, Chicago finishes no better than 8-8, and Miami finishes with a 10-6 record or worse, the Cowboys reclaim the title of all-time best winning percentage in the regular season.  Correspondingly, Dallas would also retain the best overall winning percentage.

The most important all-time statistic is Super Bowl victories (championships included, but in the modern era it is the Super Bowl).  With a Super Bowl win, the Cowboys can tie the Steelers for most Super Bowl championships all-time (6).

All stats courtesy http://www.profootballhof.com/UserFiles/file/W-L_Start_2011.pdf