Different OS for Beagleboard-xm

I have tried Ubuntu , Angstrom , Sakoman on beagleboard-xm.
I recommend you to use Angstrom (specially in case of Opencv) ,its fast than Ubuntu & have more packages than Sakoman.

for Ubuntu
http://elinux.org/BeagleBoardUbuntu

for Sakoman
http://www.sakoman.com/category/7-gnome-daily-builds-r12.html

For Angstrom
http://www.angstrom-distribution.org/demo/beagleboard/

& online Angstrom image Builder
http://narcissus.angstrom-distribution.org/

Best of  luck to All