Pacman Log Viewer is a tool used to inspect pacman log file, in particular
it lists installed, removed and upgraded packages letting you to filter
by package name and/or date.
A common use case is after a problematic update when many files are
involved and we do not much care about applied changes.
This utility works only in Archlinux and derivative and requires the QT
toolkit.
You can find this new nice app at this address.
Have fun.
EDIT: Created pkgbuilds for archlinux and chakra community repos:
aur: http://bit.ly/IxHeKU
ccr: http://bit.ly/IxGWUk