Why don't you just look at Linus's announcements? He does exactly what you want, summarizes what is new without going into the nitty gritty of every patch.

From: Linus Torvalds [email blocked]
To: Kernel Mailing List [email blocked]
Subject: Linux 2.6.6
Date: Sun, 9 May 2004 19:58:01 -0700 (PDT)

Ok, there it is (well, the tar-file and patches are still being up-loaded,
but should be there soon).

NTFS, XFS, FAT and CIFS updates. IDE cache-flush at shutdown fixes. ppc,
sparc, s390 and ARM updates (and a few x86-64 fixes).

Holler if I missed anything,