When a package is corrupt and you try to install it pacman only notifies you that _a_ package is corrupt. In my opinion pacman should either automatically remove the package (who needs a corrupt package?) or prompt the user what to do with it. The very least it could do is tell you which package was corrupt so you can manually delete it instead of doing a pacman -Scc or something.

Attatched is a log of pacman trying to update the system. I had problems downloading the abiword package, I guess that's what got corrupt. as you can see pacman isn't being very suggestive as to what was corrupt.