I just installed ICS on my HP TouchPad (CyanogenMod 9 Alpha 2). No issues getting things up and running.
For others trying it, I do get an error when I hit the voice recognition button. However, it looks like it is not limited to AutHomati0on HD. I know with CyanogenMod, the audio "is a mess" so I'm not surprised. I know they have audio out working (can hear keyboard sounds and Netflix) but I don't think the microphone input is supported yet. It is supported in some nightlies, so I'll keep trying and maybe I can get there.