After some testing, I've made a minor fix to the Rev 1.66 patch of hw/ide.c.
With this patch, and the current CVS tree, I'm once again able to see the devices after clicking on "MyComputer" in my Win98SE guest. Ben --- qemu.ORIG/hw/ide.c 2007-11-08 11:38:17.000000000 -0500 +++ qemu/hw/ide.c 2007-11-16 17:02:22.579592000 -0500 @@ -1353,7 +1353,7 @@ buf[8] = 0x2a; buf[9] = 0x12; - buf[10] = 0x08; + buf[10] = 0x00; buf[11] = 0x00; buf[12] = 0x70;