RealPlayer

realplayer can be installed in the xo

enter terminal type

wget http://software-dl.real.com/30797ed883585619ce21/unix/RealPlayer11GOLD.bin 

after it downloads type

chmod a+x RealPlayer11GOLD.bin 

after that just type

./RealPlayer11GOLD 

do what it says and done!

this will install it in /home/olpc/RealPlayer/realplay

to run it type

/home/olpc/RealPlayer/realplay

NOTE: realplayer DASE NOT work in browse so for (as i now) it only works in firefox

if you have truble viste the install page on real.com: http://www.real.com/moreinfo/playerplus_install.html?system=linux&pageid=unagi.8902005&pageregion=A1