I was a guy of archlinux some years ago. :)
But it had severals bugs when I was trying use.
Today I was trying install ArchLinux. But oh. I coudn't.
Error no /src/core/pkg is missing and if I try by FTP errors return on select packages.
How solve?
Solution: Remove /tmp/.pkgcategory [1]
[1] - http://bbs.archlinux.org/viewtopic.php?id=52584
Cheers!