Most years by NFL teams without winning playoff
Most consecutive seasons by NFL teams without winning a playoff game since 1933 (first season of NFL playoffs), according to STATS LLC:
50, Chicago/St. Louis/Phoenix/Arizona Cardinals (1948-1997)
37, Pittsburgh Pirates/Steelers (1933-1971)
33, New Orleans Saints (1967-1999)
33, Detroit Lions (1958-1990)
28, Washington Redskins (1944-1971)
23, Baltimore/Indianapolis Colts (1972-1994)
22, Cincinnati Bengals (1991-current)
22, New York Giants (1959-1980)
22, Los Angeles Rams (1952-1973)
21, Kansas City Chiefs (1970-1990)
21, Boston/New England Patriots (1964-1984)
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Online: http://pro32.ap.org/poll and http://twitter.com/AP-NFL