Just to whet a few people's appetites:

eap0 at pci0 dev 13 function 0: vendor 0x1274 product 0x1371 (rev. 0x02)
eap0: interrupting at isa irq 15
audio0 at eap0: full duplex

I have the Creative-branded AudioPCI playing on my Alpha.

I haven't written any of the AC97 mixer support yet, though.