Same problem here. 
Ubuntu 10.10 (upgrade from 10.04) on Thinkpad T60 with ATI graphic card.
Linux ubuntu 2.6.35-24-generic #42-Ubuntu SMP Thu Dec 2 01:41:57 UTC 2010 i686 
GNU/Linux

Its the only thing that still bothers me about my Ubuntu installation
and its the worst I had to face .. ever.

I tried almost everything:
- ACPI settings (BIOS)
- TLP (Software to handle Thinkpad ACPI settings)
- Pulse Audio deactivation and use of ALSA again .... fixed it for a long time 
I thought
- WLAN ?? tried several drivers .. still an open point
- ATI graphic card ... I am using the GPL drivers with "options radeon 
modeset=0"

Dec 16 11:53:09 ubuntu kernel: [10378.753076] padlock: VIA PadLock not detected.
Dec 16 11:55:17 ubuntu kernel: [10506.679450] warning: `VirtualBox' uses 32-bit 
capabilities (legacy support in use)
Dec 16 11:58:48 ubuntu kernel: [10717.542329] device usb0 entered promiscuous 
mode
...
Dec 16 13:37:03 ubuntu kernel: [16613.004065] Uhhuh. NMI received for unknown 
reason b1 on CPU 0.
Dec 16 13:37:03 ubuntu kernel: [16613.004073] You have some hardware problem, 
likely on the PCI bus.
Dec 16 13:37:03 ubuntu kernel: [16613.004078] Dazed and confused, but trying to 
continue
Dec 16 13:37:36 ubuntu kernel: [16645.625938] iwl3945 0000:03:00.0: Card state 
received: HW:Kill SW:On
Dec 16 13:37:36 ubuntu kernel: [16645.664053] iwl3945 0000:03:00.0: MAC is in 
deep sleep!.  CSR_GP_CNTRL = 0x040003DD

I hope that this issue will be fixed in newer kernel versions. 
It pretty disturbing during presentations ... and work in general.

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https://bugs.launchpad.net/bugs/116752

Title:
  NMI received for unknown reason a0 on CPU 0

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