With RPM, one can do 'rpm -qil <pkgname>' to get info and list of files. This should be possible with pacman as well.

I sent a patch for 2.8.4 to Judd that enables this feature, here's some sample output:

# ./pacman -Qil zip
Name : zip
Version : 2.3-2
Groups : None
Packager : Arch Linux (http://www.archlinux.org)
URL :
License :
Architecture :
Size : 174592
Build Date : Wed Sep 04 20:10:44 2002 UTC
Install Date : Mon Jul 19 00:49:34 2004 UTC
Install Script : No
Provides : None
Depends On : glibc
Required By : kdeutils
Conflicts With : None
Description : Creates PKZIP-compatible .zip files

zip /usr/
zip /usr/bin/
zip /usr/bin/zip
zip /usr/bin/zipnote
zip /usr/bin/zipcloak
zip /usr/bin/zipsplit
zip /usr/man/
zip /usr/man/man1/
zip /usr/man/man1/zip.1

# ./pacman -Qlip /var/cache/pacman/pkg/rar-3.3.0-1.pkg.tar.gz
Name : rar
Version : 3.3.0-1
Groups : None
Packager : dorphell <dorphell@archlinux.org>
URL :
License :
Architecture :
Size : 471708
Build Date : Fri Feb 20 16:08:47 2004 UTC
Install Date :
Install Script : No
Provides : None
Depends On : gcc glibc
Required By : None
Conflicts With : None
Description : The RAR compression program

rar usr/
rar usr/bin/
rar usr/bin/rar
rar usr/bin/unrar