Known supported cards
The following cards are known to work and have been used with Kismet. If your card isn't listed here, don't worry yet - read the directions, try it, and let me know.
The linux-wlan people have created an enormous list of cards and chipsets available here. If your card is not in the Kismet list, you can probably find the chipset and determime if it will be supported via the linux-wlan list.
Card Chipset Description Driver
Ambicom WL1100C-CF Prism/2 Abicom Compact Flash wlan-ng/hostap
Belkin 11Mbps PCMCIA Prism/2 Belkin PCMCIA adapter wlan-ng/hostap
Buffalo WLI-CF-S11G Prism/2 Buffalo Compact Flash wlan-ng/hostap
Buffalo WLI-PCM-L11 Prism/2 Buffalo PCMCIA wlan-ng/hostap
D-Link A650 ar5k D-Link 802.11a Cardbus vt_ar5k
D-Link DWL-650* Prism/2 D-Link PCMCIA with triangular antenna wlan-ng/hostap
D-Link DCF-650W Prism/2 D-Link Compact Flash wlan-ng/hostap
D-Link DCF-660W Prism/2 D-Link Compact Flash wlan-ng/hostap
Demarctech/Senao/Engenius Prism/2 100mW and 200mW Prism/2 cards wlan-ng/hostap
Cisco AIR-PCM35x aironet Cisco Aironet PCMCIA with diversity antenna kernel aironet
Cisco AIR-LMC35x aironet Cisco Aironet PCMCIA with external MMCX antenna kernel aironet
Compaq WL100 Prism/2 Compaq PCMCIA wlan-ng/hostap
Gateway Solo 9550 Orinoco Internal 802.11b on Solo 9550 orinoco (with Snax monitor patch)
Linksys WPC11 Prism/2 Linksys PCMCIA wlan-ng/hostap
Linksys WDT11 Prism/2 Linksys PCMCIA to PCI bridge wlan-ng/hostap (plx)
Linksys WCF11 Prism/2 Linksys CompactFlash wlan-ng/hostap
Microsoft USB Prism/2 Microsoft USB adapter wlan-ng
Netgear MA401 Prism/2 Netgear PCMCIA wlan-ng
Lucent PC24E Silver Orinoco Orinoco Silver PCMCIA orinoco_cs (with Snax monitor patch)
Lucent PC24E-H-FC Gold Orinoco Orinoco Gold PCMCIA orinoco_cs (with Snax monitor patch)
Rangelan-DS 8430 Prism/2 Rangelan-DS PCMCIA wlan-ng/hostap (once added to cards list)
SMC2632W* Prism/2 SMC PCMCIA wlan-ng/hostap
SMC2642W Prism/2 SMC CompactFlash wlan-ng/hostap
Teletronics WL-1100-2-3V Prism/2 Teletronics PCMCIA wlan-ng/hostap
Xircom CWE1100/1300 aironet Xircom PCMCIA kernel aironet
ZCOMAX XI-300 Prism/2 ZCOMAX Compact Flash wlan-ng/hostap
ZCOMAX XI-815 Prism/2 ZCOMAX Compact Flash wlan-ng/hostap
Zoom 4105 Prism/2 Zoom (with external antenna) wlan-ng/hostap
Cards known NOT to work
The following cards are known to NOT work for various reasons. If you manage to get one of these cards working, let me know.
* New Dlink DWL650 cards DLink appears to have replaced the prism2 chipset with one from ADMTek. This is currently unsupported in linux and cannot be used. There is no notification on the box that the chipset has changed, but the newer cards have a rectangular instead of triangular antenna.
Linksys PCI Recently Linksys has switched to using Broadcom PCI chipsets. These are not labeled differently from the PCI cards using prism/2 chipsets. There are no drivers for broadcom.
Belkin USB Belkin USB cards use the Atmel chipset. There is no rfmon support in the firmware itself, so sniffing isn't possible.
Linksys USB Recent Linksys USB cards are Atmel, not Prism/2
*New SMC PCMCIA SMC2632W v2.2 pcmcia cards are Atmel based. There are drivers for normal use but I haven't been able to get them to work in rfmon.