Case laws of DT and IDT given in the Students' monthly newsletter from the month of January 2011 to November 2011. Thus, Newsletters from the month of January 2011 to November 2011 are relevant and very important for your Nov 2011 exam. This is the link from which you can download all the students' monthly newsletter https://www.icai.org/post.html?post_id=2447.
Moreover, there are 2 files on this link: https://www.icai.org/post.html?post_id=6742 These files are of recent case laws in DT and IDT relevant for Nov 2011 exam. These are a must read and too much important file. In May 2011 exam about 30 marks questions were asked from these 2 files alone.
If you are using Vandana Bangar for IDT, then you do not need to read all the case laws of IDT from the sources given above, but Vandana Bangar Book does not cover 100% case laws upto Nov 2011 exam. So read new case laws from above given sources.


