Ok boys I did it.
1. XGL doesn't understand that 3D support is activated (with official nvidia drivers)
2. if you modify the DISPLAYMANAGER_XSERVER variable changing it (for me, from Xorg) to Xgl, rebooting the system (only CTRL+ALT+DEL doesn't work, you know..), you'll finally get your windows moving.
Achtung. On my distro, opensuse 10.2, you can do it with yast-system-sysconfig editor-display-ecc...
Achtung2. my XGL controller always want you disable xgl..simply ignore it..
now I try to use my earphones with
00:10.1 Audio device: nVidia Corporation MCP51 High Definition Audio (rev a2)
which doesn't seems to be supported...