Finally!!! An almost stable (96%) catalyst version 12.3 available for GNOME 3...

no more lagging during the transition between working and activity mode

windows 7 aero effect working perfectly under vmware

catalyst version 12.3

virtual desktop movement is quite smooth

Update (13/04/2012)
Solved laggs/slow windows movement in GNOME3 by adding this line

export CLUTTER_VBLANK=none

into ~/.profile or into /etc/profile file. Restart X server or reboot system.

ref: ATI Catalyst - ArchWiki.

How to always use a text-based location bar in nautilus 3...

Open terminal and type the command below

    $ gsettings set org.gnome.nautilus.preferences always-use-location-entry true

To switch back

    $ gsettings set org.gnome.nautilus.preferences always-use-location-entry false