Hi...
I've installed pacman 3 from testing repo and I've found some bugs in the newest makepkg version (3.0.0)
The first bug is some conflict with fakeroot:
==> WARNING: Running makepkg as an unprivileged user will result in non-root
ownership of the packaged files. Try using the fakeroot environment
by placing 'fakeroot' in the BUILDENV array in makepkg.conf.
[XazZ@darklight tmp]$ pacman -Qs fakeroot
local/fakeroot 1.5.10-1
and here a line from /etc/makepkg.conf:
export USE_FAKEROOT="y"

Second bug is in makepkg -g:
I've tested it with various PKGBUILD's.. but you can use the 3dpong PKGBUILD for example.
Open the PKGBUILD in a text editor and remove the md5sums line. Then run makepkg -g.
It displays me the following lines:
[XazZ@darklight 3dpong]$ makepkg -g
==> WARNING: Running makepkg as an unprivileged user will result in non-root
ownership of the packaged files. Try using the fakeroot environment
by placing 'fakeroot' in the BUILDENV array in makepkg.conf.

==> Making package: 3dpong 0.5-2 (Mo 26. Mär 15:26:38 CEST 2007)
==> Retrieving Sources...
-> Found 3dpong-0.5.tar.gz in build dir
==> Generating checksums for source files


[XazZ@darklight 3dpong]$

Here is some more info: [XazZ@darklight 3dpong]$ pacman -Qs pacman | grep pacman
local/pacman 3.0.0-1
Arch: i686

XazZ