whatithink
GOLD
Off the top of my head, Juventus were relegated for corruption, won Serie B and then won every Serie A since (but won't this year).Not much. But lets take a look.
Atletico Madrid: Since 1928 they have played in the 2nd league for a total of 6 seasons. 4 of those seasons were in the early 30s.
Real Madrid: Since 1928 never relegated
Barcelona: It looks like 1 time in the 30s.
Juventus: 1 time since 1929
AC Milan: 3 times since 1929
Inter Milan: Never
Man U: Last time they were not in the top division was the mid 30s
Man City: They have been up and down a fair amount. However last time was 2001
Arsenal: Last time they were not in the top league was 1914
Chelsea: 9 times since 1929. The last being 1988
Tottenham: A lot of seasons in Div 2. However the last time was in the 1977
Liverpool: Since 1904 8 seasons in Div 2. The last time was 1961
Manchester United were relegated in the early 70s, around that time period, put down by a goal from Denis Law (ex. Man U playing for City).