remove048 is the case mentioned there (fails in 3.0 but works in 3.1) :
http://www.archlinux.org/pipermail/pacman-dev/2007-September/009294.html
It's the same as remove046 with -R instead of -Rc.
sync060 is a case reported this morning on IRC :
a pacman -Su wanted to replace gensplashutils by gensplash,
but pacman said gensplashutils was required by initscripts-gensplash,
while initscripts-gensplash was not even installed.
This is also fixed in the current 3.1 code though.
upgrade02{4,5} are the backup handling problem I described there :
http://www.archlinux.org/pipermail/pacman-dev/2007-September/009376.html
Signed-off-by: Chantry Xavier <shiningxc@gmail.com>