There's a checklist for software you want. However, I think this option is only available with desktop installs. Base installs just have the essentials iirc.
Too bad there's no option to have yaourt included by default. You still have to install it manually.
EDIT: I've got a problem with Arch.
» sudo pacman -S steam
error: target not found: steam
» sudo pacman -S skype
error: target not found: skype
According to the Arch Wiki, both of those are in the official repos. I updated the mirrorlist and did sudo pacman -Syy and tried again with the same result.
Anyone have any idea of what to do?