Sorry, I missed the latest dev iso (was not in all mirrors).
I have the same problem with the latest dev iso (both from 2010-01-11): although this time, icons are there, I cannot login after logout.

I'm not a log specialist but here are some (hopefully useful) infos I found via CTL+ALT+F2:

// daemon.log
Jan 12 01:21:45 puredyne gdm-simple-slave[2836]: WARNING: Unable to open session: Failed to execute program /lib/dbus-1.0/dbus-daemon-launch-helper: Success#012
Jan 12 01:21:46 puredyne gnome-session[2864]: devkit-power-gobject-WARNING: Couldn't enumerate devices: The name org.freedesktop.DeviceKit.Power was not provided by any .service files
Jan 12 01:21:46 puredyne gnome-session[2864]: WARNING: Could not launch application 'metacity.desktop': Unable to start application: Failed to execute child process "metacity" (No such file or directory)
Jan 12 01:21:46 puredyne gnome-session[2864]: WARNING: Could not launch application 'gnome-power-manager.desktop': Unable to start application: Failed to execute child process "gnome-power-manager" (No such file or directory)
Jan 12 01:21:47 puredyne gdm-simple-greeter[2869]: devkit-power-gobject-WARNING: Couldn't enumerate devices: The name org.freedesktop.DeviceKit.Power was not provided by any .service files
Jan 12 01:21:47 puredyne gdm-simple-greeter[2869]: devkit-power-gobject-WARNING: Error invoking GetAll() to get properties: The name org.freedesktop.DeviceKit.Power was not provided by any .service files
Jan 12 01:21:47 puredyne gdm-simple-greeter[2869]: devkit-power-gobject-WARNING: Error invoking GetAll() to get properties: The name org.freedesktop.DeviceKit.Power was not provided by any .service files
Jan 12 01:21:47 puredyne gdm-simple-greeter[2869]: GVFS-RemoteVolumeMonitor-WARNING: cannot open directory /usr/share/gvfs/remote-volume-monitors: Error opening directory '/usr/share/gvfs/remote-volume-monitors': No such file or directory
Jan 12 01:21:47 puredyne gdm-simple-greeter[2869]: devkit-power-gobject-WARNING: Couldn't enumerate devices: The name org.freedesktop.DeviceKit.Power was not provided by any .service files
Jan 12 01:21:47 puredyne gdm-simple-greeter[2869]: devkit-power-gobject-WARNING: Error invoking GetAll() to get properties: The name org.freedesktop.DeviceKit.Power was not provided by any .service files
Jan 12 01:21:47 puredyne gdm-simple-greeter[2869]: devkit-power-gobject-WARNING: Couldn't enumerate devices: The name org.freedesktop.DeviceKit.Power was not provided by any .service files
Jan 12 01:21:47 puredyne gdm-simple-greeter[2869]: devkit-power-gobject-WARNING: Error invoking GetAll() to get properties: The name org.freedesktop.DeviceKit.Power was not provided by any .service files
Jan 12 01:21:47 puredyne gdm-simple-greeter[2869]: WARNING: Unable to find users: no seat-id found
Jan 12 01:22:05 puredyne gdm-simple-greeter[2869]: CRITICAL: dbus_g_error_get_name: assertion `error->code == DBUS_GERROR_REMOTE_EXCEPTION' failed
Jan 12 01:26:58 puredyne NetworkManager: <info>  Trying to start the supplicant...
Jan 12 01:27:16 puredyne gnome-session[2864]: WARNING: Could not connect to ConsoleKit: Could not get owner of name 'org.freedesktop.ConsoleKit': no such name

// user.log
Jan 12 01:19:07 puredyne ck-launch-session: error connecting to ConsoleKit

// Xorg.0.log
(II) AIGLX: Suspending AIGLX clients for VT switch

there's nothing to be found in gdm logs.