Similar crash. System dropped to a terminal for a few seconds, then pulled up GDM login.

This is on a fresh install of 9.10 where I just added a 3ware RAID card & enabled compiz again. Prior to those changes, the system has been stable for 2+ months.

ubuntu 9.10, i386
compiz 0.8.4
virtualbox 3.1.2
nvidia video
same consolekit info as the OP

I was actively typing in Flock but also running chrome, virtualbox, exaile, jungledisk, a small number of utilities, and had the RAID card doing a migration in the background. Mem use was probably around 80%.

........ syslog .........
Jan 20 23:17:01 blackbird CRON[11163]: (root) CMD (   cd / && run-parts --report /etc/cron.hourly)
Jan 20 23:17:24 blackbird pulseaudio[2171]: asyncq.c: q overrun, queuing locally
Jan 20 23:17:26 blackbird pulseaudio[2171]: last message repeated 6 times
Jan 20 23:17:26 blackbird jungledisk: xServiceTransport - Transport error during GetEvents#012xConnectFailed - HTTP connection failed: couldn't connect to host [127.0.0.1:10891]
Jan 20 23:17:27 blackbird jungledisk: Error Details (Jungle Disk Desktop 3.04 Linux Console i386)#012------------------------#012Error communicating with service#012Exception Code: xServiceTransport (107)#012Time: 01/20/2010 11:17:26 PM (GMT-8)#012Detailed Message: Transport error during GetEvents#012Error Location: JXRTransport.cpp:30 #012   via JDManagerProxy.cpp:207 #012-- Inner Exception: --#012Exception Code: xConnectFailed (4)#012Time: 01/20/2010 11:17:26 PM (GMT-8)#012Detailed Message: HTTP connection failed: couldn't connect to host [127.0.0.1:10891]#012Error Location: JungleHTTP.cpp:897 
Jan 20 23:17:27 blackbird console-kit-daemon[1182]: GLib-GObject-WARNING: instance of invalid non-instantiatable type `<invalid>'
Jan 20 23:17:27 blackbird console-kit-daemon[1182]: GLib-GObject-CRITICAL: g_signal_emit_valist: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
Jan 20 23:17:27 blackbird console-kit-daemon[1182]: GLib-GObject-CRITICAL: g_object_unref: assertion `G_IS_OBJECT (object)' failed
Jan 20 23:17:29 blackbird kernel: [63013.386732] VirtualBox[4698] general protection ip:3c3079 sp:b61f0e40 error:0 in libc-2.10.1.so[394000+13e000]
Jan 20 23:17:32 blackbird gdm-simple-slave[11196]: WARNING: Unable to load file '/etc/gdm/custom.conf': No such file or directory
Jan 20 23:17:32 blackbird pulseaudio[11208]: pid.c: Stale PID file, overwriting.

....... daemon log ........
Jan 20 23:17:27 blackbird console-kit-daemon[1182]: GLib-GObject-WARNING: instance of invalid non-instantiatable type `<invalid>'
Jan 20 23:17:27 blackbird console-kit-daemon[1182]: GLib-GObject-CRITICAL: g_signal_emit_valist: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
Jan 20 23:17:27 blackbird console-kit-daemon[1182]: GLib-GObject-CRITICAL: g_object_unref: assertion `G_IS_OBJECT (object)' failed
Jan 20 23:17:32 blackbird gdm-simple-slave[11196]: WARNING: Unable to load file '/etc/gdm/custom.conf': No such file or directory

.......... lspci ..........
00:00.0 Host bridge: Intel Corporation 82G33/G31/P35/P31 Express DRAM Controller (rev 02)
00:01.0 PCI bridge: Intel Corporation 82G33/G31/P35/P31 Express PCI Express Root Port (rev 02)
00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 02)
00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 02)
00:1a.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 02)
00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 02)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 02)
00:1c.4 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 5 (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 92)
00:1f.0 ISA bridge: Intel Corporation 82801IR (ICH9R) LPC Interface Controller (rev 02)
00:1f.2 SATA controller: Intel Corporation 82801IR/IO/IH (ICH9R/DO/DH) 6 port SATA AHCI Controller (rev 02)
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 02)
01:00.0 VGA compatible controller: nVidia Corporation G71 [GeForce 7950 GT] (rev a1)
02:00.0 RAID bus controller: 3ware Inc 9650SE SATA-II RAID PCIe (rev 01)
03:00.0 SATA controller: JMicron Technology Corp. JMB362/JMB363 AHCI Controller (rev 02)
03:00.1 IDE interface: JMicron Technology Corp. JMB362/JMB363 AHCI Controller (rev 02)
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8110SC/8169SC Gigabit Ethernet (rev 10)
04:01.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8110SC/8169SC Gigabit Ethernet (rev 10)
04:02.0 FireWire (IEEE 1394): Texas Instruments TSB43AB22/A IEEE-1394a-2000 Controller (PHY/Link)