The rivalry with the hated Cowboys has risen to Heavenly heights according to the authoritative Wikipedia no less. The November 2006 miracle come-from-behind win by the Redskins over the Cowboys is now referred to as the "Hand Of God" game in the Wikipedia article Significant rivalries in the NFL.
"The 'Hand of God' game occurred on November 5, 2006 at FedEx Field when the Redskins won through a most unusual series of events. With the game tied 19-19, Redskins kicker Nick Novak missed a 49 yard field goal attempt, turning the ball back to Dallas on downs. The ensuing plays, in turn, set up for Dallas' Mike Vanderjagt, the most accurate kicker in NFL history, to try for a 35-yard field goal with 6 seconds remaining. The kick was blocked by Redskins’ safety Troy Vincent and picked up by the Redskins' Sean Taylor. Taylor returned the kick to the Cowboys' 44-yard line with no time left on the clock. However, the Cowboys' Kyle Kosier committed a 15-yard facemask penalty on Taylor during the return, which caused the game to be extended by one untimed down. From 47 yards out, Nick Novak made the game winning field goal to send the Cowboys back to Dallas with an unexpected loss."
By Divine intervention, the Redskins were saved from a 4-12 season, but lost out on the fifth pick of the draft.
The "Hand Of God" reference is also in an eZine article Cowboys vs. Redskins - A Rivalry 47 Years Strong And Counting.
For Running Redskins' history of the Redskins-Cowboys rivalry, see -