I see this also.  Card is in pc on boot, and I get 

[   37.792000] wlan: 0.8.4.2 (0.9.2.1)
[   37.816000] ACPI: PCI Interrupt 0000:00:1f.5[B] -> Link [LNKB] -> GSI 5 (level, low) -> IRQ 5
[   37.816000] PCI: Setting latency timer of device 0000:00:1f.5 to 64
[   37.824000] ath_rate_sample: 1.2 (0.9.2.1)
[   37.840000] ath_pci: 0.9.4.5 (0.9.2.1)
[   38.636000] intel8x0_measure_ac97_clock: measured 55491 usecs
[   38.636000] intel8x0: clocking to 48000
[   38.640000] PCI: Enabling device 0000:03:00.0 (0000 -> 0002)
[   38.640000] ACPI: PCI Interrupt 0000:03:00.0[A] -> Link [LNKD] -> GSI 11 (level, low) -> IRQ 11
[   38.640000] BUG: unable to handle kernel NULL pointer dereference at virtual address 00000000
[   38.640000]  printing eip:
[   38.640000] f8d55018
[   38.640000] *pde = 00000000
[   38.640000] Oops: 0002 [#1]
[   38.640000] SMP 
[   38.640000] Modules linked in: ath_pci ath_rate_sample snd_intel8x0 snd_ac97_codec wlan ac97_bus snd_pcm_oss joydev ath_hal(P) snd_pcm snd_mixe
r_oss snd_seq_dummy snd_seq_oss pcmcia snd_seq_midi snd_rawmidi snd_seq_midi_event hci_usb bluetooth snd_seq snd_timer snd_seq_device ipw2100 ieee
80211 irda crc_ccitt parport_pc parport snd serio_raw soundcore snd_page_alloc psmouse ieee80211_crypt yenta_socket rsrc_nonstatic pcmcia_core int
el_agp agpgart pcspkr iTCO_wdt iTCO_vendor_support shpchp pci_hotplug tsdev evdev ipv6 ext3 jbd mbcache usbhid hid ide_cd cdrom ide_disk ata_gener
ic ata_piix libata scsi_mod generic raid10 raid456 xor raid1 raid0 multipath linear md_mod ohci1394 ieee1394 b44 mii ehci_hcd piix uhci_hcd usbcor
e thermal processor fan fbcon tileblit font bitblit softcursor vesafb capability commoncap
[   38.640000] CPU:    0
[   38.640000] EIP:    0060:[<f8d55018>]    Tainted: P      VLI
[   38.640000] EFLAGS: 00010292   (2.6.20-5-generic #2)
[   38.640000] EIP is at ath_attach+0x148/0x1530 [ath_pci]
[   38.640000] eax: 00000000   ebx: 00000013   ecx: 00000000   edx: df9a3dcf
[   38.640000] esi: f7e6d000   edi: dfb2e400   ebp: dfb2e400   esp: df9a3d40
[   38.640000] ds: 007b   es: 007b   ss: 0068
[   38.640000] Process modprobe (pid: 3866, ti=df9a2000 task=dfb14a90 task.ti=df9a2000)
[   38.640000] Stack: f8ce0000 df9a3dc8 00000000 00000000 00000000 00000000 00000000 00000000 
[   38.640000]        dfb2e000 00130000 dfb2fa38 00000000 00000000 00000000 00000000 00000000 
[   38.640000]        00000000 00000000 00000000 00000000 00000000 0000000b f7c572c0 00000080 
[   38.640000] Call Trace:
[   38.640000]  [<c0151291>] setup_irq+0xe1/0x1d0
[   38.640000]  [<f8d5a0f0>] ath_pci_probe+0x0/0x370 [ath_pci]
[   38.640000]  [<f8d579b0>] ath_intr+0x0/0xb50 [ath_pci]
[   38.640000]  [<f8d5a2c3>] ath_pci_probe+0x1d3/0x370 [ath_pci]
[   38.640000]  [<c01b4f0e>] sysfs_create_link+0x6e/0x160
[   38.640000]  [<f8d5a0f0>] ath_pci_probe+0x0/0x370 [ath_pci]
[   38.640000]  [<c01f6a66>] pci_device_probe+0x56/0x80
[   38.640000]  [<c0251c04>] really_probe+0x54/0x140
[   38.640000]  [<c0251d39>] driver_probe_device+0x49/0xc0
[   38.640000]  [<c0251eee>] __driver_attach+0x9e/0xa0
[   38.640000]  [<c025110b>] bus_for_each_dev+0x3b/0x60
[   38.640000]  [<c0251ab6>] driver_attach+0x16/0x20
[   38.640000]  [<c0251e50>] __driver_attach+0x0/0xa0
[   38.640000]  [<c025149b>] bus_add_driver+0x7b/0x1a0
[   38.640000]  [<c01f6c34>] __pci_register_driver+0x74/0xc0
[   38.640000]  [<f8a97030>] init_ath_pci+0x30/0x54 [ath_pci]
[   38.640000]  [<c01416ed>] sys_init_module+0x15d/0x1bb0
[   38.640000]  [<c0107acd>] sys_mmap2+0xcd/0xd0
[   38.640000]  [<c0103116>] sysenter_past_esp+0x5f/0x89
[   38.640000]  =======================
[   38.640000] Code: 89 40 04 c7 85 a4 17 00 00 e0 96 d5 f8 8b 54 24 20 8d 84 24 88 00 00 00 89 44 24 04 8b 42 1c 89 ea 89 04 24 89 d8 e8 58 e2 f3
 ff <01> 00 00 00 24 2c 0f 84 98 05 00 00 8b 5c 24 2c 8b 43 04 3d 00 
[   38.640000] EIP: [<f8d55018>] ath_attach+0x148/0x1530 [ath_pci] SS:ESP 0068:df9a3d40
[   38.640000]  <6>lp0: using parport0 (interrupt-driven).
[   38.860000] fuse init (API version 7.8)
[   38.880000] i8k: unable to get SMM BIOS version


PC is a Dell Inspiron 8600 (with ATI card and serial/parallel ports, so it's an older one).  Card info:

03:00.0 Ethernet controller: Atheros Communications, Inc. AR5212 802.11abg NIC (rev 01)
        Subsystem: D-Link System Inc D-link DWL-G650 (Rev B3,B5) Wireless cardbus adapter
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
        Latency: 168 (2500ns min, 7000ns max), Cache Line Size: 128 bytes
        Interrupt: pin A routed to IRQ 11
        Region 0: Memory at 78000000 (32-bit, non-prefetchable) [size=64K]
        Capabilities: [44] Power Management version 2
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=2 PME-


Card is inoperative.