>I am curious, though, what brands of wifi cards OpenBSD folks use for
 >APs.  From when I was investigating this a year or so ago the ral
 >cards (per the man pages) were about the only ones without some sort
 >of caveat in AP mode.

yep, ral(4) works quite well for me

ifconfig ral0
ral0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
         lladdr 00:0e:3b:08:45:41
         groups: wlan
         media: IEEE802.11 autoselect mode 11g hostap
         status: active
         ieee80211: nwid bervix_castor chan 8 bssid 00:0e:3b:08:45:41 100dBm

dmesg snip
cardslot0 at cbb0 slot 0 flags 0
cardbus0 at cardslot0: bus 2 device 0 cacheline 0x8, lattimer 0x20
pcmcia0 at cardslot0
biomask f355 netmask f775 ttymask f7ff
mtrr: K6-family MTRR support (2 registers)
softraid0 at root
root on wd0a swap on wd0b dump on wd0b
ral0 at cardbus0 dev 0 function 0 "Ralink RT2560" rev 0x01: irq 12, 
address 00:0e:3b:08:45:41
ral0: MAC/BBP RT2560 (rev 0x04), RF RT2525

I have two different pcmcia ral(4) cards that work great in hostap mode
and a rum(4) usb radio that tries(no errors) but people have trouble 
connecting.

I bought a couple mini pci ath cards to go with a pcengine board
that was going to replace my AP(currently a old ibm aptiva with a pcmcia 
card) but they turned out to be ath 2413 and they don't quite work 
right. I am sure it will only take a minor tweak to get them going but I 
have never got around to it.

My other ath card, a 5424 in a eeepc 701, does not work ether, I am 
thinking that would take a little more work to get going however.

Speaking of which, I would love to test patches for the ath 5424, be 
awesome if I could use the internal radio..