I installed Ibex on my Dell xps m1330 on the day ibex was released but things werent as smooth as they were on hardy.one of the major issue is :
Use to work out of the box on hardy heron but for some reasons stopped working on ibex. it seems its a bug and the gnome devs are working to fix it. however there is a work around which seem to work for everybody. (didnt work for me becasue i didnt try it. becasue i have already downgraded to hardy heron.) the guide involves the use of command line but nothing too difficult. you can find it here .
There is a more updated and comprehensive guude here http://bigbrovar.wordpress.com/2008/11/20/ubuntu-intrepid-ibex-on-dell-xps-m1330/