Link collection of what i used to install XBMC on my brand new apple TV 2 :
http://forum.xbmc.org/showthread.php?t=99315
http://support.firecore.com/entries/387605
http://wiki.xbmc.org/index.php?title=Install_XBMC_on_ATV2
http://wiki.xbmc.org/index.php?title=Install_XBMC_on_ATV2#Nightly
http://wiki.xbmc.org/index.php?title=XBMC_for_iOS_specific_FAQ#direct_boot