Powered off, both my systems draw between 2W & 9W. It usually sits low then spikes every 5-10 secs or so.
I have generally avoided using hibernate or suspend in the past as things would go screwy with XP occasionally. I usually advise people to shutdown completely each time for least problems but if Win7 does it problem free I will give it a try and maybe revise my recommendations!
To the OP, I have found a vast improvement especially in shutdown times with Win7 over Vista. Granted my Vista install is over 2 years old but in comparison it makes like a slug.