My Arch Setup Configuration (for crimson).

Catalyst

https://wiki.archlinux.org/index.php/Unofficial_user_repositories#catalyst
https://wiki.archlinux.org/index.php/AMD_Catalyst#Xorg_repositories

add at the beginning of /etc/pacman.conf:
    [xorg115]
    Server = http://catalyst.wirephire.com/repo/xorg115/$arch

    [catalyst]
    Server = http://catalyst.wirephire.com/repo/catalyst/$arch

then run:
pacman -Syu
pacman-key -r 653C3094
pacman-key --lsign-key 653C3094
pacman -Syu
pacman -Suu

install:
catalyst-hook
catalyst-libgl
opencl-catalyst

lib32-catalyst-utils - optional, needed for 32-bit OpenGL support on 64-bit systems
lib32-catalyst-libgl - optional, needed for 32-bit OpenGL support on 64-bit systems
lib32-opencl-catalyst - optional, needed for 32-bit OpenCL support on 64-bit systems

run:
aticonfig --initial

gistfile1.txt

TP-Wifi: https://github.com/FreedomBen/rtl8188ce-linux-driver
Grid: wget https://bitbucket.org/migerh/workspace-grid-gnome-shell-extension/downloads/workspace-grid%40mathematical.coffee.gmail.com-for-3.12.zip -O /tmp/workspace-grid.zip && cd ~/.local/share/gnome-shell/extensions && unzip /tmp/workspace-grid.zip
Yao: http://kissmyarch.blogspot.de/2012/05/two-simple-yaourt-tips.html
Gnome-extensions: https://extensions.gnome.org/#page=15|https://extensions.gnome.org/extension/751/audio-output-switcher/|https://extensions.gnome.org/extension/519/messaging-menu/|https://extensions.gnome.org/extension/615/appindicator-support/|https://extensions.gnome.org/extension/779/clipboard-indicator/|https://extensions.gnome.org/extension/413/dash-hotkeys/|https://extensions.gnome.org/extension/549/web-search-dialog/|https://extensions.gnome.org/extension/294/shellshape/|https://extensions.gnome.org/extension/508/uptime-indicator/|https://extensions.gnome.org/extension/579/chat-account-groups/|https://extensions.gnome.org/extension/351/icon-hider/|https://extensions.gnome.org/extension/604/teatime/|https://extensions.gnome.org/extension/795/format-clock/|https://extensions.gnome.org/extension/857/transparent-top-bar/|https://extensions.gnome.org/extension/860/gradient-top-bar/|https://extensions.gnome.org/extension/277/impatience/|https://extensions.gnome.org/extension/118/no-topleft-hot-corner/|https://extensions.gnome.org/extension/55/media-player-indicator/|https://gist.github.com/Elayn/a75a2be7dd5d96b442f2|https://github.com/FreedomBen/rtl8188ce-linux-driver|http://kissmyarch.blogspot.de/2012/05/two-simple-yaourt-tips.html|https://extensions.gnome.org/extension/442/drop-down-terminal/|http://thinkwiki.de/TLP_-_Linux_Stromsparen#Einstellungen_vornehmen|https://extensions.gnome.org/extension/484/workspace-grid/|http://superuser.com/questions/96739/is-there-a-method-to-export-the-urls-of-the-open-tabs-of-a-firefox-window

Multilib:
[multilib]
Include = /etc/pacman.d/mirrorlist