I posted this to netbsd-current yesterday but got no replies.  Maybe I will
fare better here:

I'm constantly getting these errors in messages and to the console:

Oct  3 21:14:42 router /netbsd: aue0: 2 usb errors on intr: IOERROR
Oct  3 21:14:54 router /netbsd: aue0: 2 usb errors on intr: IOERROR
Oct  3 21:14:54 router /netbsd: aue0: 3 usb errors on intr: IOERROR
Oct  3 21:16:04 router /netbsd: aue0: 1 usb errors on intr: IOERROR

I'm running 1.6 with a GENERIC macppc kernel on an iBook.  The device is a
Siemens SpeedStream USB 10/100 Ethernet Adapter.  The device seems to
working properly (the box has been routing traffic just fine for a little
over 20 hrs) but I could do without the constant IOERROR messages...

Dan