Beware, it can be very buggy for some people.
What gfx card do you have?
add the fllowing to your /etc/X11/xorg.conf
Code:
Section "Extensions"
Option "Composite" "Enable"
EndSection
if you are using nvidia, add this in the Device section:
Code:
Option "RenderAccel" "true"
If you are on ati hardware, use this one instead:
Code:
Option "backingstore" "true"
Restart X.
Then download xcompmgr where you can find it. It found it here
http://www.sukria.net/debian/i386/bi...1.1-1_i386.deb
Install it with dpkg -i xcompmgr_1.1.1-1_i386.deb
(mine had some dependancies error, an apt-get -f install corrected the situation.)
For transparency you need "transset", which you'll have to find yourself, try apt-get.org.
Have fun
then try xcompmgr -c to get drop shadows. of course, man xcompmgr will help you a lot.
Note that on my system it works great for 10 minutes then the computer freeze. YMMV.