GIT v1.6.6 Release Notes
========================
+In this release, "git fsck" defaults to "git fsck --full" and checks
+packfiles, and because of this it will take much longer to complete
+than before. If you prefer a quicker check only on loose objects (the
+old default), you can say "git fsck --no-full". This has been
+supported by 1.5.4 and newer versions of git, so it is safe to write
+it in your script even if you use slightly older git on some of your
+machines.
+
In git 1.7.0, which is planned to be the release after 1.6.6, "git
push" into a branch that is currently checked out will be refused by
default.
(usability, bells and whistles)
+ * "git fsck" by default checks the packfiles (i.e. "--full" is the
+ default); you can turn it off with "git fsck --no-full".
+
* "git log --decorate" shows the location of HEAD as well.
(developers)