You can find more informations about XtreemOS on the XtreemOS website :
http://xtreemos.eu/

2.0/ : This directory contains the current stable version of XtreemOS.
       It is based on Mandriva 2009.0.

3.0/ : This directory contains the current development version of XtreemOS.
       It is only recommended for developers.

If you're looking for installable ISOs, go to the following directory :
../iso/xtreemos

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If you want to be notified about new versions of XtreemOS, join the
xtreemos-announce mailling list :
http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/xtreemos-announce

For questions about using XtreemOS, use the xtreemos-users mailling list :
http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/xtreemos-users

If you are interested in XtreemOS developement, join the
xtreemos-developers mailling list :
http://lists.gforge.inria.fr/cgi-bin/mailman/listinfo/xtreemos-developers

You can also join the #xtreemos-dev irc channel on irc.freenode.net

Bug reports can be submitted to the bug tracker :
https://sourceforge.net/apps/mantisbt/xtreemos/