The Simpsons Season 11 on DVD will most probably be released in August 08. As you may have noticed Season 8 was released on August 06, Season 9 was December 06, Season 10 was August 07 but instead of releasing season 11 on December 07 they released the Simpsons Movie.
Krusty's Face
Region One | 12/06/11 Region Two | 10/10/11 Region Four | 11/02/11
Presuming you mean the DVD, Season 11 released October 7th 2008. If by chance you mean when did it air, from September 26th 1999 to May 21st 2000.
The season 6 DVD set was released on June 11, 2013.
I would have to assume that when this question was written in 2010 that Season 11 had not been released.
May 11, 2010
Season 7 is to be released on November 11, 2008
it came out November 2010
October 11, 2011 there is a pre-order on amazon
Apparently February 29th 2012
its been out since october 2008
It is already available on DVD. The DVD was released on 11/11/11.