I believe if you don't say 'tomorrow' it will work correctly. It is pretty annoying.

I'd test it myself but I sold my Galaxy Nexus on Craigslist, waiting for the Nexus 4 to be released.

Yes, it did work: http://ompldr.org/vZzZtaA

Which means you'll have to sleep after midnight if you want your Android phone to wake you, or wait for an update (like Sleeping Beauty.)

Android alarms work a bit differently to what you are thinking. The basic alarms are set around times, and when the time comes around, the alarm goes off. So as long as it's after 9:01 am when you use this command, the alarm will go off at 9am the next day correctly.

To deal with days the alarms have a 'repeat' option, listing which days the alarm should go off. Google Now can't handle these kinds of alarms yet. If you needed an alarm for a specific day then you'd probably use calendar alarms, however I don't think they're fully linked into Google Now at the moment.

Yeah this is not the case. It just sets it for the next available 9pm.