As of the 2008 season, that was the 1999 season when the Lions made the playoffs as a wild card team. They lost in the Wild Card round to the Washington Redskins, 27-13.
2002
last year
The Steelers
2010
1970
The Cowboys have missed the playoffs for three straight years - 2010-12. The Patriots last missed the playoffs in 2008.
the 2007 08 season
2008
the year of 2012
16. Same as the year before that.
2000.
The Detroit Lions last playoff appearance was 1999, their last conference championship was in 1957 also that was the year of their last championship.