I've exactly the same issue (with the same errors in .xsession-errors)
on a machine I've updated from lenny to squeeze. I'm not using an intel
video adapter there but an nvidia.
I've noticed that besides gnome-panel not showing up at the same time
two processes were consuming about 30% CPU each: udisks-daemon and
dbus-daemon.
I found a temporary workaround that allows gnome to start up normally
(but prevents gnome to detect when a disk in inserted in the system and
also causes file explorer to crash when trying browsing a removable
device): removing the org.freedesktop.UDisks.conf file from
/etc/dbus-1/system.d.
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